Join Date: Apr 2006
Thanked 253 Times in 248 Posts
Rep Power: 15
Jim, I wouldn't worry about the sticking. Sticking means "sealant" or "adhesive" and all that you need is "bedding" or "gasket". Grainger and McMaster both sell various rubber and silicon sheet materials (high density neoprene with a UV-filler should also be fine) and I'd just lay a sheet of gasket material under the base to seal it down. A properly compressed gasket works just fine--even without "gluing" itself to anything.
Bed it, tighten it lightly with some bedding compound around the bolts, and let it set up as spec'd, often 24-48 hours. Then retorque, and the bedding compound plugs the bolt holes while the gasket makes the deck watertight.
Old tech--but it still works just fine. Unless someone like Sika has a special UHDPE primer and caulk combination, which wouldn't surprise me at all.