Resin molds

How to Choose Silicone Resin Moulds (Epoxy)

Silicone moulds are key to achieving clean, glossy, and precise resin castings. When selecting, consider the shape, depth, and mould surface (gloss vs. matte), as well as the project type and recommended resin viscosity / speed. Glossy moulds provide a high-gloss finish without additional polishing, while slightly matte ones are suitable for a 'marble' or soft-touch effect.

Based on what you want to create

• Jewellery, pendants, earrings: smaller cavities, preferably thinner (thin to medium) resin for easy venting and detail.
• Coasters, trays, tiered stands: moderately deep moulds; mixtures that level well and do not form waves.
• Figures and 3D decorations: intricate moulds, slower systems with longer open times are suitable.
• Embedding flowers/insects: deeper moulds, clarity and calm curing are important; poured in stages.
• Bracelets/rings: closed shapes, pay attention to precise ratios and smooth pouring in a thin stream.

Recommendations: moulds × resin

Silicone mould care: how to extend its life

• Cleaning: wipe with a soft cloth after casting. Allow resin residue to harden and gently 'peel' off - do not pull with nails or sharp objects.
• Storage: flat, unfolded, away from direct sunlight and heat. Do not place heavy objects on the moulds.
• Temperature: keep to the recommended range of the mould and resin manufacturer; extreme heat shortens life and can deform.
• Release: for complex shapes, a release agent for silicone/epoxy will help (saving edges and detail).
• Dyes and powders: apply pigments, alcohol inks and metallic powders sparingly; excess can leave marks and shorten the life of the mould.

Common Mistakes and How to Avoid Them

• Bubbles in the corners: Before the main pour, wipe the corners of the mould with a thin layer of resin (brush/spatula), then pour slowly and thinly.
• Cloudiness or overheating: For larger volumes, pour in layers and observe pauses according to the mixture's recommendations.
• Dull mould imprint: A dull mould = a dull cast. For a glossy finish, use a glossy mould, or polish afterwards.
• Cast sticking: A separating spray will help with intricate shapes; do not overload the mould by 'breaking' it forcefully.
• Scratched mould: Do not use abrasive cleaners or sharp tools; a scratch is immediately visible on the cast.

What to combine the moulds with

FAQ – Frequently Asked Questions about Silicone Moulds

Are these moulds also suitable for UV resin?

Yes, most silicone moulds are compatible with both two-component epoxy resin and UV resin. For deeper moulds, pay attention to the transmission of UV light – a thinner layer cures better.

How do I know if a mould will give a glossy surface?

The mould cavity itself must be optically smooth and glossy. The cavity looks, the cast will look – the gloss 'transfers'.

What if I want to cast a larger volume (e.g. a thicker coaster)?

Choose a slower mix with a longer open time and pour in layers. You minimise heat (exothermy) and the risk of clouding or sink marks.

Can moulds be repaired if they get scratched?

Light hairline scratches can sometimes be 'polished' with a soft cloth and a suitable product, but deep scratches will usually remain visible. Prevention is gentle cleaning and storage.

How do I prevent rings and unevenness on the surface?

Work on a perfectly level and clean surface, do not pour in a stream from a height, maintain a stable temperature (approx. 22–24 °C) and cover against dust after casting.