If the fuel tanks are cast iron or steel, first you will have to make sure of the integrity of the tanks for rust and deterioration before you do...
this stuff is amazingly stiff and tough depending on which type and thickness you get. The bluewater series is the highest density and comes in...
floor board what I would use and have is some coosa composite. This is impervious to rot and will last the lifetime of the boat. You can find...