Holding tank
Sorry about the delay getting back to you. I first made a topless tank out of 1/4 inch plywood with a filler block on the bottom so it drains completely, and temporary blocking on the inside to hold it together. This was then covered with epoxy and fiberglass cloth on the outside. After removing the temporary blocks, Ifiberglassed the inside. A top was made, prefiberglassed on the inside, and then glassed onto the tank. The tank is the same size as the original except that the top forward corner is pushed in 3/4 inch. This gave me enough clearance to install it as a complete tank. The side of the v-berth was removed to get access. I reinstalled the v-berth side with screws and blocks so it can be removed again if needed. Sofar the tank is working perfectly with no smell. One note, on my 1981 boat, the thru-hull is on the port side. on older boats, it is to starboard, and would prevent installing the tank the way I did.
