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303 Aerospace Protectant has been recommended for years to use on your kitchen overhead vent or exhaust fans(Dometic fans) to keep the gasket pliable and the vent from sticking to the gasket in hot weather. While at several Good Sam Rallies they were actually handing out small wet wraps of it to rub your gaskets down on their fans. I'm going to give it a try on the cap since ours is starting to caulk some even with the wax that has been put on twice a year.
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