Ben, I built a plywood/fiberglass sink two years ago. Now have sold the house and moving into another. If I do build my own sink again, I will NOT use any fiberglass cloth in between layers of fiberglass. That was a big mistake. I would just use the fiberglass. Probably at least three layers. Someone mentioned the West Marine system. That is what I would use next time. One very good reason is that they have measuring syringes to help keep the proportions in order. This is important because you will be making numerous batches. They also offer a selection of hardeners that will let you choose your set-up time. The faster it hardens the more batches you need to deal with. I made my joints with a router, glued them together and secured with brass screws. I cut slots in lengths of pipe insulation and put that along the front top edge. That foam is easier to rest your arms on than a sharp plywood edge. Good luck, Gary ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.