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Leaking formwork is one of the most common challenges when pouring epoxy resin for tables. A well-sealed mould is essential to ensure a smooth finish and avoid unnecessary mess or wasted resin.
Why Leaks Happen and How to Prevent Them
Formwork leaks occur when resin finds even the smallest gaps in the joints or corners of your mould. Since epoxy flows readily, any opening can result in resin escaping before it cures. Preventing leaks is best done by applying a continuous bead of silicone along all seams and corners before assembling your mould. Choose a neutral-cure, non-stick silicone to effectively block gaps and keep your formwork leakproof throughout the pouring process.
Enhancing Mould Security with Release Film or Tape
Using a release film or special tape inside your mould offers two important benefits: it prevents resin from bonding with the formwork, and it adds another layer of defence against leaks. Simply line the mould’s inside with a purpose-made film or robust, smooth tape after sealing all joints. This ensures the resin stays contained and makes removal of the finished table hassle-free.
If you’re seeking an all-in-one approach with both silicone and film included, the “River-Table” kit provides these essentials as part of a beginner-friendly pack.
Practical Steps for Leak-Free Casting
- Inspect and dry-fit all mould parts before applying silicone.
- Press silicone thoroughly into every seam, smoothing with a finger or spatula.
- Allow sufficient cure time for the silicone before pouring resin.
- Carefully line the inside surfaces with release film or tape, ensuring no folds or gaps.
- Consider testing your sealed mould with a small amount of water beforehand, checking for any signs of leaks.
When Leak Prevention Really Matters
Meticulous mould sealing is particularly crucial when working with large volumes of resin, deep pours, or expensive pigments. Even a small leak can cause major loss and spoil your table’s shape or finish, making careful preparation vital for success.
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Mastering leak prevention in epoxy table projects is as important as resin choice or finishing techniques. For a comprehensive guide to all stages of making tables with epoxy resin, see our main table-making FAQs.