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Old 11-22-2011, 04:57 PM
Andrew Werby Andrew Werby is offline
Level 10 user
Join Date: Dec 2005
Location: Oakland, CA
Posts: 647
Re: Anyone repaired a tear in silicon?

Clean the area well, to remove any dust or oils on the surface. Use pure silicone rubber caulk, the single-component stuff that comes in tubes and smells like vinegar. Like Mantrid advises, make some room for it by removing some material from the inside of the mother mold. Spread the caulk on the back surface of the damaged area. Reinforce the patch with a cloth mesh of some sort, worked well into the caulk. Push the split edges together as closely as possible from the front to correct the alignment, and wipe away any caulk that goozes through the crack. Let set 24 hours, or until thoroughly cured.

Andrew Werby
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