I am replacing a rotten plywood floor in my aluminium boat 4.35 metres long.
What thickness of marine plywood should I use?
Also it has been suggested that before gluing on the carpet to the plywood, it is best to paint the plywood, to give it more water proof quality?
What type of paint should I use?
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As far as sealing it goes, any marine-grade or at least weatherproof (although this won't necessarily repel salt so well) will do - both Bondall and Feast Watson have some products for you.