Epoxy vs UV resin vs polyester: which resin to use for jewellery, tables and art
TUREFF• •0
Walk into a craft shop or search online and you will find several kinds of resin, all sold for similar-looking projects. They are not interchangeable. Each cures in a different way, suits different sizes of project and carries different safety considerations. This guide compares the main types in general terms so you can choose the right one before you buy.
Epoxy resin
How it works: two parts, resin and hardener, mixed at a fixed ratio. They react chemically and cure over hours to days.
Good for: coasters, trays, paintings and wall art, larger jewellery pieces, wood fillings, and, with a deep pour formula, river tables and thick castings.
Strengths:
- Low odour compared with polyester.
- Very clear, glossy and tough when fully cured.
- Long working time for art techniques.
- Comes in coating and deep pour versions.
Things to know:
- Ratio and mixing must be accurate.
- Slow cure: you wait a day or more before handling, and longer for full hardness.
- Skin contact can cause sensitisation, so gloves are essential.
- Deep pours must use a product rated for that depth to avoid overheating.
- Most clear epoxies yellow gradually with time and exposure to light; UV stabilisers slow it rather than prevent it.
UV resin
How it works: a single, ready-to-use liquid that hardens when exposed to ultraviolet light, usually from a UV lamp, in a matter of minutes.
Good for: small jewellery pieces, pendants in bezels, charms, small repairs, sealing small items and quick fixes.
Strengths:
- No mixing and no ratio to get wrong.
- Cures in minutes under a lamp.
- Ideal for building up small pieces layer by layer.
Things to know:
- Light must reach all the resin, so it only cures in thin layers, often only a few millimetres per pass. Thick pours can stay liquid underneath.
- Heavily pigmented or opaque colours block light and can cure poorly.
- More expensive per amount, so it is impractical for big projects.
- Many UV resins contain acrylates, which can also cause skin sensitisation. Gloves and ventilation still apply.
- Cured UV resin can be more brittle than fully cured epoxy.
Polyester resin
How it works: a liquid resin cured by adding a small amount of catalyst (an organic peroxide, often MEKP). It cures relatively quickly and generates heat.
Good for: traditional casting, some embedding work, fibreglass and boat or car repairs.
Strengths:
- Cures hard and can be polished.
- Long-established for casting and fibreglass work.
Things to know:
- Strong odour: polyester resin contains styrene, and together with the catalyst it gives off strong fumes. It needs serious ventilation, and often a respirator.
- The catalyst itself is hazardous; follow the safety data sheet precisely.
- Shrinks more as it cures than epoxy.
- Less forgiving and generally less suited to beginners working indoors.
Water-based and mineral alternatives
There are also water-based, two-part materials, often described as acrylic resin or jesmonite-style systems. These combine a mineral powder, usually gypsum-based, with a water-based acrylic liquid.
Good for: trinket trays, coasters, plant pots, terrazzo-style homeware, sculptures and casting.
Things to know:
- They produce an opaque, stone-like finish rather than glass-clear resin.
- Generally lower in fumes than epoxy or polyester, though you should still read the SDS and wear protection; mixing the powder can create dust.
- Pieces may need sealing to resist water and stains.
- Not every brand is available in every country.
Which one should you choose?
- Small jewellery and charms: UV resin for quick, thin layers; epoxy for thicker or more durable pieces.
- Coasters and wall art: epoxy, coating or casting according to depth.
- Tables and thick castings: a deep pour epoxy rated for the thickness you need.
- Stone-look homeware: a water-based mineral system.
- Fibreglass and repairs: polyester, with proper ventilation.
Whatever you use, read the manufacturer's data sheet for pour depth, cure time and safety, and do not use resin pieces for food unless the product is certified for it.
Which resin do you use, and for what? Share your experiences and questions in the comments.