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for sealing up the cracks I used Interlux Watertite Epoxy Filler from WEst Marine for the structural cracks then feathered it out with Bondo (much cheaper but you gotta work FAST!) vhord, yes, that's a 'year' issue, my '69 was the same way with the tank box less than an inch from the plywood subfloor. I tossed my stock styrofoam insulator and custom made a slightly thinner one from pink foam board, which dropped the tank a bit, then I used 1/4" plywood for a seam splice above the tank (but the Intertite Epoxy is what's really holding it, fantastic stuff) and 3/4 everywhere else. my thread '69 Safari bath repair has fotos...
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