Which moulds are suitable for resin?

Why silicone moulds work best

Silicone moulds are the top choice for resin projects. Their flexible surface allows for easy removal once your resin has cured, leaving behind a glassy, smooth finish free from snags or surface marks. Silicone is non-stick and durable, so it can be used repeatedly for consistent casting results.

If you’d like to see this in action for making coasters, have a look at the Free Step-by-Step Lesson “Kiwi Coasters”, where silicone shapes are used to create intricate designs easily.

Other mould options and precautions

While plastic or metal moulds might be tempting, they often don’t release resin easily and can damage your project or the mould itself. If using other materials, ensure they are flexible or specially treated for resin release. For beginners, sticking to silicone is generally simplest and offers reliable results. Also, always check that your chosen mould can withstand the slight warmth that develops as resin cures.

Getting the best results from your resin moulds

• Always clean and dry your mould thoroughly before pouring.
• If reusing silicone moulds, lightly dust with talc or use a mould release spray for effortless demoulding.
• Store silicone shapes flat, away from direct sunlight, to keep them in top condition.
• If you’re looking to experiment, starter kits like the Resin Geode Coaster Starter Kit include reusable silicone moulds to get you going.