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The best I've found is Butyl caulk but silicone is also excellent. The Butyl stays pliable and silicone remains "rubbery", for lack of a better word.
------------------ Wayne Webb Webb Sign Studio creators of "woodesigns" "autograph your work with excellence" webbsignstudio@digitalexp.com
Posts: 7405 | From: Chipley,Florida,United States | Registered: Oct 1999
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I have never found water leakage a problem with screw holes in sheet metal. The same goes for pop rivits, despite the fact that rivits have a hole through them, unless you buy the kind that are enclosed on the blind end. They are considered 'waterproof.'
Certainly though, using silicone could be a good selling point. You can also dip the open end of a regular pop rivit in silicone to seal it aginst water.
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