Join Date: Aug 2008
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Re: Corroded aluminum port light- paint before using Buytl?
Butyl does not really "bond", but rather forms a sticky gasket. I have used it on glecoat, plastic, aluminum, steel and wood with no problems. It should work with painted surfaces too, but the failure point becomes the paint to the metal. With my ports I just cleaned the aluminum with wire brush and green scotch pads and after several years have had no problems or leaks. It creates such a good waterproof seal that I have not worried about corrosion on the inner surface.