Gordon,

The holding tank on my boat is an oddly shaped trapezoid, about 7 feet
long, that follows the curve of the bilge. When the PO's previous
disastrous attempt at building one failed (a ugly story in itself), we
built our own, using fiberglass, about 1/2" thick, with baffled walls,
air vents, access ports, etc. It hold more than 50 gallons.

The entire project's cost was under $500, and we had a lot of epoxy and
cloth left over. We used additives that made the glass less porous to
liquid or oder. It has worked well ever since.

Because it was our first exploration into using glass, it was probably a
bigger job than it should have been, but even still, we couldn't find a
cheaper alternative, given the odd dimensions we were trying to fit.

Given that todays epoxy prices have increased I'm not sure how cost
effective this might be, but compared to the prices you're quoted, it
still sounds like a better solution.

If you want additional advice about it, contact me off list. Good luck
with your project.

Cheers,

Robb



Gordon Wedman wrote:
Anyone had a plastic holding tank fabricated lately? I was quoted $1,200
for a tank that might hold 15 gallons. It would be prism shaped, 30 inches
long, 20 inches on each side and 18 inches across the top. I figure there
might be 25 square feet of plastic at most. I was told the material alone
was $800. That's something like $30/square foot. Is that what 3/8" thick
poly sheets go for these days? I didn't think those plastic cutting boards
you buy at Wal Mart cost $30.
So is this the going rate these days?