that's a lot of fiberglass.
A fuel tank
down in the bilge
area needs to be protected. My boat
was designed/built to have its fuel tank
in the keel/bilge, below the engine
. It was held in with 2-part expanding foam and thickened resin on the edges to cap it off. The resin part cracked, water got down into the foam and water sat there against the aluminum
tank. I removed it all when I found out there was a leak and found two holes and a LOT of low spots only paper thin.
Other owners have replaced their tanks for the same reason and many have coated their replacement tanks with fiberglass before placing it back down into the keel
. Some have sealed the empty space in more glass to seal it off and others have left air space between the tank and hull
so water wouldn't stay trapped.
One person, replaced their tank with a fiberglass tank using boards he made himself out of epoxy for the baffle/front/tops and since 2005, he's had no issues with it. His fuel capacity went from 25 gal to 39 gal from using the space that was taken up from foam. I decided to build mine from fiberglass as well and still in the middle of the project
. Not easy work and if it's all successful, my boat will have a tank that will last a long time.
I had also thought of 2 tanks at one point, but decided one large tank will be a good way to go. Instead of Epoxy, I decided to go with vinylester. Smelly stuff, but read it's good for this purpose. It's been a learning
experience throughout. For a few flat pieces, I used a mirror sprayed down with PVA, laid down a layer and wet it out one at a time to start with, then built up additional layers once it was in place.
Best of luck to you, how ever you end up doing it.