
Frank Marine
A solid base has no hollow underside for water to sit in, and it gives you a flat footprint to bed down on sealant. It also means the load goes into your deck through the bolts, so what sits behind the deck matters more than the cleat does.
Yes, on any cleat you would actually moor to. Bolts through bare fibreglass or an alloy gunwale concentrate a snatching load into a few small holes and eventually pull through. A backing plate in marine ply or metal spreads that load across the panel and saves the deck.
It will if you bolt bare metal to bare metal. Stainless and aluminium sitting together in salt air set up a galvanic cell and it is the alloy that goes chalky and pits. Use an isolating paste or gasket at every contact face and under the washers.

Frank Marine

Frank Marine

Frank Marine

Frank Marine

Frank Marine

Frank Marine
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