After waxing the finished plug and applying PVA separator, I applied a layer of gelcoat. In this case, I had a gelcoat repair kit that included a gelcoat base that was more of a gel than a liquid like I used in the cowl mold. I bushed it on, and it worked fine for this small part. Then I laid up 5 layers of mat fiberglass with polyester resin. This being a small mold, I wasn't too concerned about shrinkage, so I laid up all the layers at one time. Separated just fine. I then trimmed the mold to produce a 3/4” flange on the completed parts and then hot glued it to a spray paint can top as a base.