Hi Pat, Make a cardboard template, make a plug using plywood & extruded Styrofoam. Glass & smooth it. Wax it well, 5 times at least. I have found that Turtle Wax car polish,,wax,, works much better than the official stuff. Paint on 3 coats of PVC release liquid. Apply a decent layer (ers), of CSM & give a couple days drying time. Pop it off, clean it up. Wax it, etc. as above lay up a few layers of CSM etc., etc. & there it is. A new part & a mold for future use. Very satisfying. I haven't made PVC pipe unit yet but prob. will.