Thanks for the advise. I just had to throw away a newer tank that was installed with foam. I did a lot of reasearch on this and know the risks of plastic tanks. My bay boat is 12 years old and has May problems with water in the fuel. I don't use ethanol free gas because of the price and convenience. The biggest change I've made is to use a 2 micron separator. The maintains that has protected my system. It's the same filter the fuel polisher guy used. I've had good luck with that plastic tank.
My biggest risk I properly installing. I have 1/2" on each side and will need to line the stringers with neoprene. The bottom will also need to be fully supported. This will take some work as the bottom changes pitch along its length. I'm planning on shaving foam blocks down to fill the gap then glassing them in. They will also get a layer of neoprene. I don't have plans for a removable hatch but I have an idea that I may try. What about a indention delineating a cut line? That's what my bay boat has with it's plastic tank.
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