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Silicone question

Posted by ms_minnamouse (My Page) on
Mon, Mar 28, 11 at 13:34

I have a question about silicone, like the kind you use for kitchen and bath, windows and doors, etc.

Will wet silicone bond with dry silicone? What I mean is, if you do put some silicone down and it dries and then you add more onto it later, will it bond and create a water tight seal?

Follow-Up Postings:

RE: Silicone question

In my experience, it will not bond very well, although it may seem to if you lay down a big bead of it that covers the old stuff. Generally, it's usually better to cut away old caulk -- of any kind -- with a razor blade before re-caulking.

What are you trying to do?

RE: Silicone question


Adding almost any kind of caulk/sealer/etc. over another, even the same type/kind/brand, is not a good practice.

Silicon glazes when cured, creating a smooth imprevious finish that resists moisture/dirt/etc.

So, if there is a problem with an existing area, remove all the old sealer, clean with alcohol, make sure all moisture and foreign materials are gone, and reapply new material.

RE: Silicone question

Ok, I called Dow Corning and they said that it will adhere and create a water tight seal. I'll rough up the silicone where I add to it just in case and hope for the best.

I'm sealing an aquarium.

RE: Silicone question

Well, good luck. If it starts leaking in a while, follow the advice about removing the old stuff.

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