When new resin is placed on cured resin, the epoxy must have good adhesive or “sticking” properties. It has to be a good glue to bond to a non-porous surface. Anything that has a waxy, oily, or greasy coating will not stick to the resin. But, if you remove the grease, you can turn the surface into one that the resin will stick to.
Epoxy is a good glue, so it can stick to polyester. Yes, as I said before, the epoxy formula can stick to a surface that has a cured epoxy resin. To ensure that you have prepared the surface correctly for an adhesive bond to form between the cured surface and the fresh finish, you need to sand with 120 grit sandpaper and clean before applying the formula. No, because no cured epoxy surface will allow a chemical bond for another epoxy layer.
However, you can sand it and then another layer of epoxy must be adhered to it. Unfortunately, this is not going to be a durable and reliable project. Release of the mold will generally prevent chemical bonding. Physical bonding is another story, and it can be macro or micro. Polyethylene plastic is used in the manufacture of many resin molds, so it is an excellent material to use since the epoxy resin does not stick to it.
This allows you to easily remove the item from the mold without destroying it in the process. Epoxy resins are the best finishes you can use on your furniture, such as tables, kitchen cabinets, and other wooden structures. So, when choosing a resin for your project, it's important to consider both the type of resin and the amount of resin used between layers. The fiberglass material is completely transparent and very thin and completely fragile.
While photos, souvenirs, and heirlooms look great when embedded in resin, think twice before placing them in a resin mold. It is economical and tear-resistant, but it can be taped to the work surface and the cured epoxy will peel off.
