I can say what NOT to use, silicone! It does not adhere well to smooth surfaces, loosens over time-allowing water to leak past the loosened seal, and if it begins to loosen you can pull the entire run off at once. When it is removed it leaves a residue that requires a special cleaner to remove or nothing else will stick to those surfaces.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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