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Bill,
When I replaced mine with plastic a few years ago what I did was build the foundation from sheet foam strips as a form and glassed that over. Then I glued the tanks to the fondation with 5200. I did foam in just the corners since they are not going to flex anyway. Then I went over the tanks in 2 or 3 places with 2" glass tape to hold the tank down in place. Used a 3 or 4 pieces of tape over one another. The install is fine, maybe not as good as if you were paying someone to do it but adequate. The only thing I would have done different is on my tank straps use 7 or 8 layers of glass tape. What I did works but remember the glass itself isn't going to stick to the plastic tank, it may at first but after a few waves no. But it is holding the tanks inplace since the tape is glassed to the hull.
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