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Preparing your formwork correctly is crucial for a successful resin casting project. Using silicone rubber as a sealant and a release film creates a smooth workflow and a clean result, preventing leaks and making demoulding a breeze.
What Does Silicone Rubber Do in Formwork?
Silicone rubber is applied along the edges and seams of your resin mould or formwork to create a flexible, leak-proof barrier. This step is vital to prevent resin from escaping during the pour, especially when working with deep applications or live-edge wood projects. The pliable nature of silicone allows it to fill even tiny gaps and adhere well to a variety of surfaces, making it the preferred choice for both beginners and experienced makers.
Why Add a Special Release Film?
A release film—sometimes called a shiny shield or release sheet—is used to line the base or interior walls of your formwork before pouring the resin. This film creates a non-stick surface, ensuring that your finished piece can be removed from the mould easily and cleanly, with minimal effort. The film is typically transparent and easily removable, and it does not leave sticky residue on your finished object.
How to Apply for Best Results
- Clean your formwork to remove dust and debris.
- Apply silicone rubber thoroughly to all corners and seams, allowing it to fully cure for leak prevention.
- Line your mould or base with release film before pouring in resin.
- Press the film down firmly so it adheres smoothly with no folds or bubbles.
You’ll find these materials included, along with full instructions, in kits like the River Table Complete Kit.
When This Matters
If you’re casting deep resin pours, crafting tables, or working with detailed edge work, using proper sealing and a release film is essential to avoid wasted materials and ensure your project releases perfectly from the mould.
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Mastering the use of silicone rubber and release film simplifies the resin casting process, especially for table making and larger craft projects. For further techniques and guidance, see the full range of resources on how to work with resin.