Yes and No:These molds are constructed from HMWPE (High Molecular Weigh Polyethylene) which is a smooth surface that high quality, slow curing resins won’t stick to. Once your epoxy/resin piece has cured, simply tap the sides and then the bottom to release your piece. To help prolong the lifespan of your mold we recommend this Mold Release. It is also best practice to use this Mold Release when using other brands of resin that we do not sell on our website.