The Complete Guide to Craft Resin — Epoxy, UV Resin, Moulds, Pigments, and Safety

What Craft Resin Is — And Why It Has Become So Popular

Craft resin is a material that starts as a liquid and cures (hardens) into a clear, solid, glass-like substance. Once cured, it is hard, durable, waterproof, and can be crystal-clear or coloured, glittery, opaque, or filled with embedded objects like dried flowers, photographs, or glitter. The transformation from pourable liquid to permanent solid is what makes resin so creatively compelling — you can capture anything inside it, coat surfaces with a glossy finish, or cast it into moulds to create jewellery, coasters, decorative objects, and artwork.

The popularity of craft resin has grown dramatically, driven by social media visibility and the accessibility of starter kits. The creative possibilities are genuinely wide — from simple coasters and keyrings to elaborate ocean-scene art, river tables, and intricate jewellery. Each piece is unique, which adds to the appeal for makers who want one-of-a-kind results.

It is worth noting from the outset that resin crafting involves chemical substances that require careful handling. This guide covers safety thoroughly because it matters. Resin crafting is safe when done properly, but it is not a material to use casually without understanding the precautions.

Epoxy Resin — The Two-Part System Explained

The most common craft resin is epoxy resin — a two-part system consisting of resin (Part A) and hardener (Part B). When mixed together in a precise ratio (typically 1:1 or 2:1 by volume, depending on the product), the two liquids undergo a chemical reaction that transforms them from liquid to solid over a period of hours.

The mixing ratio is critical. Too much or too little hardener relative to the resin will result in a piece that does not cure properly — remaining sticky, soft, or cloudy. Always measure precisely using graduated measuring cups, following the manufacturer's instructions exactly.

After mixing, you have a working time (also called pot life) — typically 30 to 45 minutes for most craft epoxy — during which the mixture remains liquid enough to pour, add colour, remove bubbles, and position in moulds. After the working time, the resin thickens and begins to gel. Once fully cured (typically 24 to 72 hours depending on the product and conditions), the result is a hard, clear, durable solid.

The curing process generates heat (an exothermic reaction). This is normal, but it means that thick pours generate more heat, which can cause problems — yellowing, cracking, or warping. This is why different resin formulations exist for different thicknesses.

Coating Resin vs Casting Resin vs Deep Pour

Not all epoxy resin is the same. Different formulations are designed for different purposes:

Coating Resin

Thicker, higher-viscosity resin designed to be poured in thin layers over flat surfaces — tabletops, artwork, photographs, wood. Coating resin is self-levelling (it spreads evenly across a surface) and cures to a high-gloss, glass-like finish. It is typically poured no more than 3–6 mm (about a quarter of an inch) deep per layer.

Coating resin is the choice for resin art (pouring coloured resin across a surface to create abstract designs), protecting artwork (sealing paintings, photographs, or wood surfaces), and tabletop finishing.

Casting Resin

Lower-viscosity (thinner, more fluid) resin designed to be poured into moulds. Casting resin cures more slowly than coating resin, which reduces heat buildup and allows thicker pours without cracking or yellowing. Typical maximum pour depth is 10–20 mm (half to three-quarters of an inch) per layer.

Casting resin is the choice for jewellery moulds, coasters, decorative objects, and any project where resin is poured into a shaped mould.

Deep Pour Resin

Specifically formulated for very thick pours — up to 50 mm (2 inches) or more in a single layer. Deep pour resin cures very slowly (sometimes several days) and generates less heat than standard casting resin. It is used for river tables (wood slabs with a resin-filled channel), large embedments, and thick sculptural pieces.

Which to Start With?

For beginners, a casting resin with a 1:1 mix ratio is the most versatile and easiest to use. The 1:1 ratio simplifies measuring and reduces the chance of errors. A small starter kit (enough for several small projects) allows you to learn the basics without a large investment.

UV Resin — Instant Cure for Small Projects

UV resin is a single-part resin (no mixing required) that cures when exposed to ultraviolet light — either from a UV lamp or strong sunlight. Curing takes minutes rather than hours, making UV resin ideal for small, thin projects where speed is valued.

UV resin is popular for jewellery making (filling bezels, coating small pendants, creating small cabochons), coating small objects, and quick repairs. Its limitation is that it only cures in thin layers — UV light must penetrate the entire depth of the resin to cure it. Thick pours will remain liquid in the centre because the UV cannot reach them.

UV resin is more expensive per volume than epoxy resin but eliminates the mixing process and cures almost instantly. For small jewellery projects and quick applications, the convenience can be worth the higher cost. A UV lamp is required — standard household lighting does not produce sufficient UV intensity for reliable curing, and relying on sunlight makes curing time unpredictable and weather-dependent.

Silicone Moulds — Shapes, Quality, and Reusability

Silicone moulds are the standard for casting resin. Cured epoxy resin does not stick to silicone, so pieces release cleanly from the mould without damage — and the mould can be reused many times.

Moulds are available in an enormous range of shapes — circles, squares, hearts, spheres, pyramids, jewellery bezels, coasters, trays, letters, numbers, and novelty shapes. The quality of the mould affects the quality of the finished piece:

Good moulds are made from smooth, high-quality silicone with no visible seam lines inside, flexible enough to demould without tearing, and thick enough to hold their shape when filled with liquid resin.

Poor moulds may have visible texture or seam marks that transfer to the resin surface, may be too thin (collapsing when filled), or may tear after only a few uses.

Reading customer reviews is the most reliable way to assess mould quality before purchasing. Look for feedback on surface finish, flexibility, durability, and dimensional accuracy.

You can also make your own moulds using silicone mould-making rubber — useful for creating custom shapes or replicating existing objects.

Colouring Resin — Pigments, Mica, Inks, and Dyes

Epoxy resin is naturally clear (or slightly amber). Adding colour is one of the most enjoyable parts of resin crafting. Several types of colourant are used:

Mica powders — Fine mineral powders that create pearlescent, metallic, and shimmering effects. Mica is the most popular resin colourant, available in hundreds of colours. A small amount goes a long way. Mica must be mixed thoroughly to avoid streaking.

Liquid resin pigments — Concentrated liquid dyes specifically formulated for resin. Available in transparent (for stained-glass effects) and opaque (for solid colour) versions. Easy to dose and mix.

Alcohol inks — Create vivid, flowing colour effects in resin. Alcohol inks are popular for abstract resin art because they disperse and move within the resin, creating organic patterns. They produce transparent, vibrant colour.

Resin dyes — Similar to liquid pigments but typically more concentrated. Used for saturated, deep colour.

Important: Do not use water-based paints or dyes in resin. Water prevents proper curing and causes cloudiness, softness, and failure. Only use colourants that are specifically compatible with resin, or that are confirmed solvent-based and water-free.

Embedding Objects in Resin

One of resin's most appealing qualities is the ability to embed objects inside it — creating permanent, preserved displays of meaningful or beautiful items.

Dried flowers — The most popular embedment. Flowers must be completely dry (not fresh) — any moisture will cause cloudiness, bubbles, or curing failure. Use flowers that have been dried in silica gel or pressed and fully dehydrated.

Photographs and paper — Must be sealed (coated with a clear sealant) before embedding to prevent the resin from soaking into the paper and turning it translucent.

Glitter — Available in many shapes, sizes, and colours. Fine glitter suspends in resin better than chunky glitter, which tends to sink. Layered pours (adding glitter to multiple layers rather than all at once) distribute glitter more evenly through the piece.

Small objects — Shells, coins, charms, beads, stones, and other small items. Items must be completely dry and free from moisture.

The key principle for all embedments: moisture is the enemy. Anything embedded in resin must be completely dry. Porous items (wood, paper, fabric) should be sealed before embedding.

Removing Bubbles — Heat Guns, Torches, and Technique

Bubbles are the most common challenge in resin crafting. They form during mixing and pouring, and they can remain trapped in the cured piece as visible flaws.

Heat gun — A craft heat gun directed briefly over the surface of freshly poured resin brings bubbles to the surface and pops them. This is the most common bubble-removal method.

Kitchen torch — A small butane torch (the kind used for crème brûlée) passed quickly over the resin surface achieves the same result. The brief flash of heat pops surface bubbles effectively. Keep the flame moving — holding it in one place can scorch the resin or damage silicone moulds.

Mixing technique — Slow, deliberate stirring (rather than vigorous whisking) introduces fewer bubbles during mixing. Scraping the sides and bottom of the mixing cup ensures thorough mixing without excessive agitation.

Warm resin — Gently warming the resin bottles (in warm water, not hot) before mixing reduces viscosity and allows bubbles to rise and escape more easily.

Safety — The Non-Negotiable Section

Craft resin is a chemical product. The liquid resin and hardener can irritate skin, sensitise the immune system (leading to allergic reactions with repeated exposure), and release fumes during mixing and curing. Once fully cured, epoxy resin is generally inert and safe — the risk is during handling of the liquid components.

Safety is not optional. It is the foundation of enjoyable, sustainable resin crafting.

Gloves

Nitrile gloves are essential — wear them whenever handling liquid resin or hardener. Nitrile provides better chemical resistance than latex or vinyl. Change gloves if they tear or if resin soaks through.

Eye Protection

Safety glasses or goggles prevent accidental splashes from reaching your eyes. Liquid resin in the eyes is a medical emergency.

Respiratory Protection

A respirator with organic vapour cartridges is strongly recommended, especially in spaces without excellent ventilation. Standard dust masks are not sufficient — they do not filter chemical vapours. A half-face respirator with the correct cartridges protects your lungs from fumes.

Ventilation

Work in a well-ventilated space. Open windows, use fans to direct fumes away from your breathing area, and avoid working in small, enclosed rooms. Good ventilation reduces fume concentration and makes working more comfortable.

Skin Contact

If liquid resin contacts your skin, wash immediately with soap and water. Do not use solvents on skin. Repeated skin contact can cause sensitisation — an allergic reaction that, once developed, makes future resin use difficult or impossible.

Workspace Setup

Level surface — Resin is self-levelling. If your work surface is not level, your piece will cure unevenly — thicker on one side than the other.

Protected surface — Cover your work surface with a silicone mat, plastic sheeting, or a disposable tablecloth. Cured resin is extremely difficult to remove from surfaces.

Warm, stable temperature — Resin cures best at a consistent room temperature (approximately 21–24°C / 70–75°F). Cold temperatures slow curing; excessively hot temperatures accelerate it and can cause problems.

Dust-free environment — Dust that settles on uncured resin becomes permanently embedded. Cover poured pieces with a box, dome, or clean container while curing.

Cleanup supplies — Isopropyl alcohol (rubbing alcohol, 90% or higher) for cleaning uncured resin from tools and surfaces. Paper towels. Disposable or reusable silicone mixing cups and stir sticks.

Finishing — Sanding, Polishing, and Drilling

Cured resin pieces may need finishing to achieve a smooth, glossy surface — particularly if they have rough edges from mould marks, or if the surface is not perfectly smooth.

Sanding — Wet sanding with progressively finer grits (starting around 400 grit and working up to 2000 or higher) removes imperfections and smooths edges. Always sand wet to avoid creating resin dust (which should not be inhaled).

Polishing — After sanding to a fine grit, a polishing compound restores the glossy, clear finish. Resin polishing compound is applied with a soft cloth or a buffing wheel.

Drilling — Resin can be drilled for adding hardware (keyrings, earring hooks, pendant bails). Use a sharp drill bit at low speed and drill slowly to avoid cracking or chipping.

Coating — Applying a thin layer of fresh resin over a sanded piece restores a perfect glossy finish without the need for extensive polishing. This "flood coat" technique is quick and effective.

Choosing the Right Supplies — A Comparison

Common Mistakes and How to Avoid Them

Inaccurate measuring. The resin-to-hardener ratio must be precise. Eyeballing measurements results in uncured, sticky, or cloudy pieces. Use graduated measuring cups every time.

Inadequate mixing. Undermixed resin has soft spots, sticky areas, and uneven curing. Mix thoroughly for the time specified in the instructions — typically three to five minutes — scraping the sides and bottom of the cup.

Pouring too deep. Each resin type has a maximum pour depth. Exceeding it generates excessive heat, causing yellowing, cracking, or warping. Pour in layers if your project is deeper than the maximum.

Working without safety equipment. Skipping gloves, eye protection, or ventilation is not worth the risk. Skin sensitisation from repeated unprotected exposure is real, cumulative, and irreversible.

Demoulding too early. Impatience is the enemy of good resin. Demoulding before the resin has fully cured distorts the piece. Follow the manufacturer's cure time — it exists for a reason.

Embedding wet items. Moisture causes cloudiness, bubbles, and cure failure. Everything embedded in resin must be completely dry.

Your Pre-Purchase Checklist

What type of project are you starting with?

Moulds (jewellery, coasters) need casting resin. Surface coating (art, tabletops) needs coating resin. Small jewellery pieces can use UV resin.

Do you have safety equipment?

Nitrile gloves, safety glasses, and ideally a respirator with organic vapour cartridges. This is not optional.

Is your workspace suitable?

Well-ventilated, level, protected surface, consistent temperature, and a way to cover pieces during curing.

Do you have measuring and mixing equipment?

Graduated measuring cups, mixing cups, stir sticks. Precise measurement is essential.

Do you have a way to remove bubbles?

A heat gun or small kitchen torch. Both are effective and affordable.

Have you budgeted for consumables?

Gloves, mixing cups, stir sticks, and mould release are ongoing costs. Silicone cups and sticks can be reused (cured resin peels off).

Why Buying Through Amazon Is a Smart Option

Amazon carries craft resin from starter kits through to bulk resin, silicone moulds in every conceivable shape, pigments, mica powders, and safety equipment. Customer reviews from resin crafters describe clarity, cure time, ease of mixing, and bubble behaviour — practical information that helps you choose a resin that performs well for your intended use.