It's been a while since I looked at a 20' Sceptre's floor. The way I would do it is cut out the floor leaving 1 1/2" all the way around the edge, remove the floor so you can get to the stringers, foam, inspect the gas tank, make repairs, etc.. Make a template of the "new" floor area all the way around to the inner liner, cut 3/4" coosa board the same size off the template, cover with 1708 on both sides (maybe two layers) and bond on to the 1 1/2" lip you left. Glass the coosa to the inner liner and fair. You could just paint up the sides 6" or so the same color as the floor and get good results if you color match. Your new floor will be 3/4" higher if you use coosa, there are other options.
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