We use sikaflex for boat and rv sealant , very tough and stays flexable, rv places sell it. It comes in black or white, but if you want gray you can mix the two to desired color. Much better than silicone. But for a porch light high quality silicone should work
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Keith, Krista and Family
77 38' Newell Coach Repowered from Smokin' V555TA To 325hp 8.3 inline 6 cummins, Allison 3000 series trans
87 40' Newell Coach 475hp 8V92 DD(sold)
22' 350hp Jet Riverboat
79 Ford F250 4x4
Many others to list
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