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In a message dated 09/24/2001 2:11:03 AM Atlantic Daylight Time,
writes:
> Hallo all,
> My husband is planning to build a holding tank in our wooden boat (H28).
Has
> anybody had experience doing this themselves, and could offer any tips?
> He has read an article saying you can build one using plywood coated with
> epoxy resin, with internal baffles. The only place to put it will be under
> the forward V-berth. Holding tanks are not common where we live, but will
be
> required as we go further up the Australian coast.
I think you can do this but just coating with epoxy will not be enough. The
expansion and contraction of the plywood with temperature and humidity
changes will crack the joints and let the contents leak out.
Personally, I would purchase a heavy polyethylene tank. They do make them in
bow shapes. Sealand is a good brand and I have one that has done fine for
years.
One could also be custom made by a commercial outfit, or even by oneself with
some effort. Metal would be my second choice, steel or aluminum.
If you want to go with the plywood, you really won't need a baffle if it is
stout enough. Use 3/4" plywood and fiberglass the heck out of the inside.
In fact, why not just use plywood for a form and make the tank of solid
fiberglass. Use epoxy and fiberglass with fiberglass tape reinforcement in
the corners, then remove the plywood. Be sure to include a hand hole so you
can clean the thing out and inspect or repair it once in a while. I have
heard there are flat fiberglass panels available. You could cut them and
then glass the corners together.
Norm
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