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Originally Posted by JoeFromPA
So plain black silicone caulk is fine to use on the top material? Does it work to hold the fabric against itself?
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Nope, caulk has no mechanical strength whatsoever. It only keeps things together if there is enough surface.
I don't think I would use black silicone caulk on canvas. It can become kind of messy and, in the end, I don't think it will adhere enough. People have been waterproofing canvas for a couple of hundred of years now and there are better ways to do this. In the army we used some kind of a green paste to waterproof our bags, etc. There must be something similar around for canvas. Maybe one of the sailors here can comment?