Do You Need Release Film or Silicone for Resin Formwork?

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Do I Need Release Film or Silicone Sealant for My Resin Form?

Choosing the right release method for your resin casting formwork can make all the difference to your finished project. If you’re new to resin art or crafting, it’s worth understanding when to use release films or silicone sealants for hassle-free results.

Why Use Release Film or Silicone Sealant?

Resin can bond strongly to many surfaces, making it difficult to demould pieces without damaging them or your mould. Applying a release film or using a silicone paste forms a barrier, preventing unwanted sticking and helping to achieve smooth removal. Release films are particularly useful when working on flat bases, while a silicone paste is ideal for sealing joints and edges to prevent leaks. Both methods protect your final piece from imperfections caused by formwork adhesion.

How to Prepare Your Formwork

Start by choosing a clean, stable surface for your casting base. If your project includes enclosed sides, carefully apply silicone sealant along every seam to ensure no resin seeps out. For flat bases or when you want the easiest demoulding experience, use a quality release film—such as the Shiny Shield included in the River-Table Complete Kit. Make sure the film is applied smoothly without wrinkles, and always follow the instructions for the sealant or release agent you’re using.

When Does This Matter Most?

Proper release preparation is especially important when working with intricate formwork, detailed edges, or expensive materials. Beginners benefit from using kits that include both release film and silicone paste to minimise mistakes and make their first projects more enjoyable.

Related guides

What To Put Underneath For Resins And

Taking the time to seal and line your resin moulds with the right materials will help you achieve clean, professional results. For a streamlined start, consider a kit designed specifically for resin casting formwork like those found in our full guide on what to put underneath for resins and.