The Complete Guide to Oil Paints — Materials, Mediums, and Getting Started

Why Oil Paint Still Matters

Oil paint has been the dominant medium of Western painting for over five hundred years. The luminous flesh tones of Renaissance portraits, the atmospheric skies of the Impressionists, the thick, textured surfaces of modern expressionism — all achieved with pigment suspended in drying oil.

In a world of fast-drying acrylics and convenient water-based paints, oil paint endures because nothing else quite matches its qualities. The slow drying time allows extended blending — you can work into a passage for hours, softening edges and refining transitions in ways that faster-drying mediums simply do not permit. The paint itself has a buttery, luxurious consistency that many painters find deeply satisfying to work with. And the finished result has a depth and richness — a quality of light reflecting through transparent layers — that has kept painters returning to oils for generations.

Oil painting has a reputation for being complicated, messy, and demanding. There is some truth in this — it involves more materials and more decisions than acrylic painting, and the drying time requires a different approach to workflow. But the fundamentals are straightforward, and the arrival of water-mixable oil paints has removed the most significant barrier for beginners: the need for toxic solvents. Whether you choose traditional or water-mixable oils, getting started is more accessible now than at any point in the medium's history.

How Oil Paint Works — Pigment, Binder, and Curing

Oil paint consists of pigment (ground colour) mixed with a drying oil — most commonly linseed oil, though safflower, walnut, and poppy oil are also used. The drying oil serves as the binder, holding the pigment particles together and adhering them to the painting surface.

Unlike acrylic and watercolour paints, which dry by evaporation (water leaving the paint), oil paint cures by oxidation — the oil reacts with oxygen in the air, gradually polymerising (forming molecular chains) into a tough, flexible film. This process is slow: a thin layer becomes touch-dry in days, but full curing — where the paint reaches its final hardness — can take months or even years for thick applications.

This oxidation process is what gives oil paint its unique properties. The slow curing means the paint remains workable on the canvas for hours, allowing the extended wet-on-wet blending that defines the medium. The cured film is durable and flexible, which is why oil paintings from the fifteenth century can still look remarkably fresh when properly cared for. And because the binder remains clear and transparent after curing, light passes through the paint layers and reflects back, giving oil paintings their characteristic luminosity.

Understanding that oil paint cures by chemical reaction rather than evaporation explains many of its practical requirements — why ventilation matters (the oxidation process involves volatile compounds), why layering follows specific rules (different layers cure at different rates), and why patience is part of the process.

Traditional Oil Paint vs Water-Mixable Oils

This is the most important choice for anyone starting in oil painting, and it is worth understanding clearly.

Traditional Oil Paint

Traditional oil paints are thinned and cleaned with solvents — historically turpentine, and more commonly today, odourless mineral spirits (OMS). These solvents dissolve the oil binder, making the paint thinner and more fluid for initial layers, and are used to clean brushes after a painting session.

Traditional oils offer the widest colour range, the most refined handling properties, and the deepest history of proven longevity. Many experienced painters prefer their buttery consistency and the seamless blending they allow. The drawback is the solvents: they produce fumes that require adequate ventilation, they are flammable, and long-term exposure carries genuine health risks. Some painters develop sensitivity to solvents over time. In shared spaces, classrooms, and homes without dedicated studio ventilation, traditional solvents are a significant practical concern.

Water-Mixable Oil Paint

Water-mixable oils (also called water-soluble or water-miscible oils) are genuine oil paints — made from the same pigments and drying oils as traditional oils — but with a modified oil binder that allows them to mix with and be cleaned up with water. The molecular structure of the oil has been altered to make it accept water as a thinner and cleaning agent, eliminating the need for solvents entirely.

Water-mixable oils handle very similarly to traditional oils. They have the same buttery consistency, the same slow drying time, and support the same techniques — wet-on-wet blending, glazing, impasto, and layered painting. Cleanup requires nothing more than soap and water. The reduced fumes make them suitable for home studios, shared spaces, and environments where ventilation is limited.

There are some differences. Water-mixable oils can feel slightly different in texture compared to traditional oils — some painters describe them as marginally less smooth, particularly when thinned with water rather than a dedicated water-mixable medium. Using a small amount of water can make the paint feel sticky; using a water-mixable linseed oil or dedicated medium instead produces a much better painting experience. The colour range from most manufacturers is slightly smaller than their traditional oil range, though it has expanded significantly and covers all essential colours.

The question of long-term durability is the one area where some debate remains. Traditional oil paintings have a proven track record spanning centuries. Water-mixable oils have been available for a much shorter period, and some research suggests the emulsifier that allows water-mixing may slightly affect the curing process. For the vast majority of painters — including professionals — this is not a practical concern, and major manufacturers stand behind the archival quality of their water-mixable ranges.

Quality Grades — Student vs Artist

As with other painting mediums, oil paints are manufactured at student and artist (professional) quality levels.

Student grade oil paints use lower pigment concentrations and more filler. All colours in a student range typically cost the same because the manufacturer avoids expensive pigments, substituting hue versions (blends of cheaper pigments that approximate the colour). The paint handles reasonably well and is perfectly adequate for learning techniques and developing skills.

Artist grade oil paints contain higher concentrations of finely ground, carefully selected pigments. The paint feels richer on the brush, colours are more intense, and mixing produces cleaner results. As with acrylics and watercolour, artist-grade oils are priced in series based on pigment cost — earth colours are affordable, cadmiums and cobalts are significantly more expensive.

The handling quality of artist-grade oil paint — the weight on the brush, the way it moves across the canvas, the richness of the colour — is one of the great sensory pleasures of painting. If budget allows, even beginners benefit from starting with at least a few artist-grade colours alongside a student-grade set. At minimum, an artist-grade titanium white (or the lead-free alternative, titanium-zinc white) is worth the investment, as white is the most frequently used colour in oil painting.

Understanding the Paint Tube Label

Oil paint labels carry information similar to other mediums, with a few oil-specific additions:

Colour index name — The standardised pigment code (e.g., PB29 for ultramarine blue). Single-pigment paints mix most cleanly.

Series number — Indicates the price band based on pigment cost.

Lightfastness rating — Usually ASTM I (excellent) or II (very good). Oil paint generally has excellent lightfastness because the oil binder itself offers some UV protection to the pigments.

Opacity/transparency — Shown as a filled, half-filled, or empty square. Particularly important in oil painting for understanding which colours work well as transparent glazes and which provide opaque coverage.

Oil vehicle — The drying oil used as the binder. Linseed oil is most common. Some lighter colours use safflower or poppy oil because linseed oil can yellow slightly over time, which is more visible in pale colours.

Drying rate — Some manufacturers indicate whether a colour is a fast, medium, or slow dryer. Earth colours (umbers, siennas) generally dry fastest; colours with high oil content (blacks, some reds) dry slowest.

Drying Oils — Linseed, Safflower, Walnut, and Poppy

The drying oil used in oil paint — both as the binder in the tube and as a medium you can add — affects drying time, finish, and long-term behaviour.

Linseed oil is the most commonly used drying oil and the standard binder for most oil paints. It produces a strong, durable paint film and dries at a moderate rate. Refined linseed oil is the most common form. Cold-pressed linseed oil retains more natural properties and is slightly slower drying. Linseed stand oil (heat-treated) is thicker, dries to a smooth, enamel-like finish, and yellows less than standard linseed oil. The main drawback of linseed oil is a tendency to yellow slightly over time, which is most noticeable in very pale colours and whites.

Safflower oil yellows less than linseed oil and is often used as the binder in white and pale-coloured oil paints. It produces a slightly less durable film than linseed oil and dries more slowly.

Walnut oil is a traditional alternative to linseed oil with less tendency to yellow. It dries more slowly than linseed but produces a flexible, durable film. Walnut oil is popular among painters who want to avoid solvents entirely, as it can be used both as a painting medium and for brush cleaning.

Poppy oil dries the slowest of the common drying oils and yellows the least, making it popular for very pale colours. However, the slow drying time and slightly less durable film mean it is generally reserved for lighter tones rather than used throughout a painting.

Mediums Explained — What They Do and When to Use Them

Mediums are substances added to oil paint to modify its behaviour. They can thin the paint, speed or slow drying, increase transparency, change the finish, or improve flow. Understanding mediums is one of the areas where oil painting can feel complicated, but the basics are straightforward.

Drying oils (linseed, walnut, safflower) — Added to paint to increase flow, transparency, and gloss. They slow drying time and make the paint "fatter" (more oil content). Used in later layers of a painting.

Solvents (turpentine, odourless mineral spirits) — Thin paint by dissolving the oil binder. They make paint leaner and faster-drying. Used in early layers. Evaporate completely from the paint film. For water-mixable oils, water serves a similar thinning function, and dedicated water-mixable thinners are available.

Alkyd mediums — Synthetic resin-based mediums that speed drying time significantly (often touch-dry within a day) while improving flow and transparency. Popular for painters who want the qualities of oil paint with faster layering. Available in both traditional and water-mixable formulations.

Gel mediums and impasto mediums — Thicken the paint for heavy texture work without adding extra oil. Allow you to build thick, sculptural layers that hold their shape.

Glazing mediums — Increase transparency and flow for thin, luminous layers applied over dried paint. Essential for classical layered painting techniques.

For beginners, the simplest approach is to start with just the paint from the tube, adding a small amount of the appropriate medium only when you want the paint thinner or more fluid. Many painters, including professionals, work with very little medium — sometimes none at all. You do not need a collection of mediums to begin. A single bottle of the appropriate oil (linseed oil for traditional oils, water-mixable linseed oil for water-mixable oils) is sufficient for starting out.

The Fat-Over-Lean Rule — Simpler Than It Sounds

The fat-over-lean rule is the most important structural principle in oil painting, and it sounds more intimidating than it is.

"Fat" means paint with a higher oil content — either paint straight from the tube, or paint with added oil medium. Fat paint is flexible, slow-drying, and glossy.

"Lean" means paint with less oil content — paint thinned with solvent (or water, in water-mixable oils). Lean paint is less flexible, faster-drying, and more matte.

The rule: Each successive layer of a painting should be at least as fat (or fatter) than the layer beneath it. In other words, early layers should be lean and later layers should be fat. Lean paint over fat causes cracking because the lean upper layer dries and hardens faster than the fat layer beneath, which continues to move as it cures.

In practice, this means starting with thin, solvent-diluted (or water-diluted) paint for your initial sketch and underpainting, then using paint straight from the tube for middle layers, and adding a small amount of oil medium for final layers if desired.

The simplest way to follow the rule: begin with thinned paint, progress to paint straight from the tube, and if you add oil medium, only add it in later layers. If you paint alla prima (completing the painting in a single session while everything is wet), the rule does not apply because all your paint dries as one unified layer.

Solvents, Safety, and Ventilation

For traditional oil painting, solvents require respect and sensible precautions.

Turpentine — The traditional solvent. Strong smell, effective as both a thinner and brush cleaner. Produces significant fumes that require good ventilation. Some painters develop allergies or sensitivity with prolonged exposure.

Odourless mineral spirits (OMS) — The most commonly used modern solvent. Much less odour than turpentine but still produces vapours — the reduced smell does not mean reduced toxicity. Still requires ventilation. Should not be used in an unventilated space.

Ventilation requirements — If using solvents, work in a room with at least one open window, ideally with cross-ventilation (two openings for air to flow through). Keep solvent containers closed when not actively dipping your brush. Do not eat or drink in the same space. Wear gloves if you have sensitive skin.

Fire safety — Rags and paper towels soaked with linseed oil or solvent can self-combust if crumpled and left in an enclosed space. Lay used rags flat to dry in a well-ventilated area, or submerge them in water in a sealed metal container. This is not an exaggerated precaution — linseed oil rags are a genuine fire hazard.

Painting Without Solvents — Yes, It Is Possible

If the safety and practical concerns around solvents are a barrier, you have excellent alternatives.

Water-mixable oil paints eliminate the need for solvents entirely. Thin with water or water-mixable medium. Clean brushes with soap and water. No fumes, no fire risk from solvents, no ventilation requirements beyond normal room air.

Solvent-free traditional oil painting is also possible. Many painters work with traditional oils using only oil (walnut oil is popular) as a medium and for brush cleaning. Rather than dissolving paint in solvent, you wipe excess paint from the brush with a rag, dip in walnut oil, wipe again, and repeat. The paint is leaner in early layers simply by using less paint applied thinly, and becomes fatter as you add more oil in later layers. This approach requires more rags and slightly more patience with cleanup, but it works well and is used by many professional painters.

Oil of spike lavender — A plant-derived solvent with a pleasant smell, sometimes used as a natural alternative to turpentine. Less toxic than mineral spirits but still requires reasonable ventilation.

Building a Starter Palette

Oil paint mixes beautifully, and a limited palette produces more harmonious results than a large collection of colours. A strong starting palette:

Warm yellow — Cadmium yellow medium (or cadmium yellow hue in student grade) Cool yellow — Lemon yellow or cadmium yellow light Warm red — Cadmium red (or pyrrole red as a cadmium-free alternative) Cool red — Alizarin crimson permanent or quinacridone magenta Warm blue — Ultramarine blue Cool blue — Phthalo blue (powerful tinting strength — use sparingly) Titanium white — Buy the largest tube available. This is your most-used colour by a wide margin Burnt umber — Fast-drying earth colour, invaluable for underpainting and mixing rich, warm darks Burnt sienna — Warm brown, useful for skin tones, landscapes, and complementary mixing Yellow ochre — Muted earthy yellow, endlessly useful in natural subjects

This palette can mix virtually any colour you need. Earth colours (umber, sienna, ochre) are among the fastest-drying pigments, making them particularly useful in early, lean layers — which conveniently aligns with the fat-over-lean rule.

Brushes, Palette Knives, and Surfaces

Brushes

Oil painting uses broadly the same brush shapes as acrylic — rounds, flats, filberts (a flat brush with a rounded tip, particularly popular in oil painting for blending), and riggers for fine lines. The key difference is that oil painting traditionally uses natural bristle brushes (hog hair) for their stiffness, which helps move thick oil paint around the canvas. Softer brushes (sable, synthetic) are used for blending and detail work.

For water-mixable oils, synthetic brushes work very well and are easier to maintain. Hog bristle brushes also work but should be cleaned with soap and water rather than just water, as they can become stiff if not thoroughly cleaned.

A starting set: two or three flat or filbert brushes in different sizes (small, medium, large), a medium round brush for detail, and one or two large brushes for underpainting and washes.

Palette Knives

A palette knife (or painting knife) is used for mixing paint on the palette and, for some techniques, applying paint directly to the canvas. A good palette knife is flexible, comfortable to hold, and essential for efficient mixing. A diamond-shaped painting knife in a medium size is the most versatile starting point.

Surfaces

Canvas — The classic oil painting surface. Pre-stretched, pre-primed canvases are widely available. Cotton canvas is standard; linen canvas is preferred by many professionals for its finer texture and greater durability, but costs significantly more.

Canvas boards and panels — Rigid, portable alternatives to stretched canvas. Good for practice, studies, and smaller works.

Wood panels — Birch plywood, MDF, and hardboard make excellent rigid painting surfaces when properly primed with oil-compatible gesso. Some painters prefer the firm, unyielding surface of a panel.

Priming — Oil paint should not be applied directly to raw canvas or unprimed wood, as the oil will eventually degrade the fibres. Surfaces should be primed with gesso. Most pre-made canvases and boards are pre-primed and ready to use. If priming your own surfaces, use an acrylic gesso (which is compatible with oil paint despite being acrylic-based) or a traditional oil ground.

Setting Up Your Workspace

Oil painting requires a bit more workspace planning than acrylics or watercolour.

Palette — A flat, non-absorbent surface for mixing paint. Traditional options include a wooden palette (sealed with a thin coat of oil), a glass palette (easy to clean with a razor blade), or a tear-off paper palette pad. A palette at least 30 × 40 cm (12 × 16 inches) gives adequate mixing space.

Brush cleaning — For traditional oils, a jar of OMS or turpentine for initial brush rinsing, followed by soap and water. For water-mixable oils, two jars of water (one for rinsing, one for clean mixing) and soap for end-of-session cleaning.

Rags and paper towels — You will use a lot of these. Old cotton rags work well and are reusable. Remember the fire safety precaution for oily rags.

Easel — While not strictly necessary (you can paint flat on a table), an easel holds your canvas at a comfortable angle and frees both hands for painting. A tabletop easel is sufficient for smaller works. A floor-standing easel suits larger canvases and more regular painting.

Drying Time — The Advantage That Requires Patience

The slow drying time of oil paint is both its defining advantage and its greatest demand on your patience.

Touch-dry times vary by paint thickness, pigment, and conditions. Thin layers of earth colours may be touch-dry in one to three days. Thicker layers of slow-drying colours (ivory black, cadmium red) may take a week or more. Water-mixable oils generally dry somewhat faster than traditional oils.

Full curing takes much longer — six months to a year for an average painting, potentially longer for very thick applications. This is why final varnishing is not recommended until at least six months after completion.

The slow drying gives you time to blend, adjust, and rework that no other medium matches. A painting can be worked on over multiple sessions across days or weeks, with each return finding the previous layer still workable or at least receptive to new paint. This extended working time is why portraitists, landscape painters, and anyone who values smooth, gradual transitions often prefer oils above all other mediums.

Choosing the Right Oil Paint — A Comparison

Common Mistakes and How to Avoid Them

Using too much solvent. Heavily thinned paint in early layers is fine — but dipping your brush in solvent every few strokes produces weak, chalky paint that will not adhere well long-term. Use solvent sparingly, and only when you genuinely need to thin the paint.

Ignoring fat over lean. Painting a lean, fast-drying layer over a fat, slow-drying one is the classic cause of cracking. Follow the simple progression: thin and lean early, thicker and fatter later. If in doubt, work without any medium at all — paint straight from the tube is a safe, stable layer at any stage.

Expecting acrylic-speed drying. If you are accustomed to acrylics, the drying time of oils will test your patience. Resist the temptation to add thick layers before earlier ones have had time to set. Embrace the working time rather than fighting it.

Using too much medium. A common beginner instinct is to add lots of medium to make the paint easier to work with. Too much oil creates a weak, glossy, slow-drying layer prone to wrinkling. A tiny amount of medium goes a long way. Start with paint from the tube and add medium only when you have a specific reason to.

Poor brush cleaning. Oil paint left in a brush, even overnight, begins to cure and will eventually ruin the brush permanently. Clean brushes thoroughly at the end of every session — solvent or water first, then soap and warm water, then reshape and dry.

Not protecting your surfaces. Oil paint stains. Cover your workspace with disposable paper or an old cloth. Wear old clothes or an apron. Once oil paint is on fabric, it is there for good.

Forgetting about drying rags. Oily rags left bunched up in a pile or in a closed bin can spontaneously combust. Lay them flat to dry or store in a sealed metal container with water. Take this seriously.

What Oil Paint Cannot Do — Honest Limitations

It dries slowly. The extended working time that makes oils so valued for blending also means you cannot build up multiple layers quickly. Painters who work in layers must wait between sessions, sometimes days. This is not a medium for impatient workflows.

Solvents are a genuine concern. If using traditional oils with solvents, proper ventilation is non-negotiable. Water-mixable oils solve this problem effectively, but if your heart is set on traditional oils, you need a suitable workspace.

It is the most demanding medium to learn. The mediums, the fat-over-lean rule, the drying times, the cleanup — oil painting involves more decisions and more maintenance than acrylics or watercolour. This is manageable, but it is honest to acknowledge that the learning curve is steeper.

Yellowing is real. Linseed oil-based paintings can yellow slightly over time, particularly in dark or low-light storage conditions. Paintings displayed in normal light conditions are less affected. Safflower and poppy oil yellows less but produces a less durable film.

It is not easily corrected once dry. While wet oil paint can be scraped off or wiped away readily, dried oil paint is permanent and cannot be dissolved away (short of drastic measures). Painting over mistakes is straightforward, but removing them is not.

Varnishing requires patience. A final varnish should not be applied until the painting has cured for at least six months. This means finished paintings need to be stored carefully during that waiting period.

Cleaning Up and Caring for Your Equipment

Brushes (traditional oils): Wipe excess paint on a rag. Rinse in OMS or turpentine, working the bristles gently. Follow with a thorough wash in warm water and brush soap. Reshape bristles and store flat or upright to dry.

Brushes (water-mixable oils): Wipe excess paint on a rag. Rinse in water, working the bristles gently. Wash with brush soap or mild household soap. Rinse thoroughly, reshape, and dry.

Palette: Scrape off unused paint at the end of each session (or cover with clingfilm and refrigerate overnight if you plan to continue the next day — this slows the curing process). Glass palettes clean easily with a razor blade. Wooden palettes can be wiped with a rag and a touch of oil.

Paint storage: Tubes should be stored with caps firmly closed, threads wiped clean of paint. Oil paint in tubes has a long shelf life — years if properly stored. If a tube becomes stiff or hard to squeeze, gentle warming (in warm water) can soften the contents.

Your Pre-Purchase Checklist

Traditional or water-mixable?

If you paint at home, in a shared space, or do not have dedicated studio ventilation, water-mixable oils are the sensible choice. If you have a well-ventilated studio and are drawn to traditional oils, they remain an excellent option.

What quality grade suits your starting point?

Student grade is perfectly adequate for learning. Consider artist-grade titanium white regardless — the mixing improvement is significant.

Do you have appropriate brushes?

Two or three flats or filberts in different sizes, a medium round, and a palette knife cover most starting needs. Synthetic brushes work well with both traditional and water-mixable oils.

Have you chosen a painting surface?

Pre-primed canvas boards are the most affordable and practical option for starting out. Stretched canvas for pieces you want to display. Ensure whatever surface you use is primed for oil paint.

Do you understand the basic workspace requirements?

A palette, brush cleaning setup (appropriate to your paint type), rags or paper towels, and adequate space. If using traditional oils with solvents, ventilation is essential.

Are you prepared for the drying time?

Oil painting rewards patience. Plan for drying time between sessions if working in layers. Consider alkyd mediums if you want faster drying without losing the oil paint experience.

Do you have a plan for fire safety?

Oily rags must be dried flat or stored in sealed metal containers. This applies to both traditional and water-mixable oil paints — the linseed oil is the fire risk, not the solvent.

Why Buying Through Amazon Is a Smart Option

Amazon carries comprehensive ranges of both traditional and water-mixable oil paints from all major manufacturers, along with mediums, brushes, canvases, and accessories. The ability to compare starter sets, read reviews from fellow painters, and access the full spectrum from student to professional grade in one place makes it a practical resource for building your oil painting setup. Returns are straightforward if a product does not suit your needs.