New holding tank, being built by forming the inside shape with blue foam. It will then be glassed up using west systems epoxy. When done, acetone will be poured in a hole, which will disolve the foam. Sort of a "lost foam" mold.
Now that it is finished, here are some things I learned from the tips I got from others.
1. Take any plastic film off the styrofoam, or what ever foam you use. This is very important. The film will not disolve, and it is a real bear to get out once it's done. Trust me on this.
2. Cut all the fiberglass out before you start. Make each side or end, allowing them to overlap a bit. Cut all layers, stack them up. As you make each side, stack all the pieces for a side on a piece of cheap clear painter's drop cloth, outside piece against the plastic, inside piece up. A six sided piece would have six pieces of clear plastic, each with a stack of cut pieces on it.
3. Right on the plastic, wet one entire stack with resin. Probably best if you wet a couple layers, then add a couple more pieces, use a roller to work out all the air bubbles. Once all the sheets in one stack are wetted, pick up the plastic, with the wet fiberglass on it, turn it over and lay it on the mold. Leave the plastic on top, smooth it out, work out any air bubbles. Leave the plastic on. Use it to keep everything laying down. It'll keep the loose strands flat at the edges, and help it make it around the corners, even if the radius is pretty tight.
4. Keep adding a side as the previous one has set up pretty well, It's a dilema, if it's still pretty soft, it'll stick better to the next part, but it'll also not stay where you want it.
When it is all done, and everything is cured, drill one of the holes in it that you'll need and pour in some acetone. It took about a quart to disolve all the foam in this tank.