Mold release sprays help to extend the shelf life of our molds. We recommend Stoner Themoset for Polyester and Epoxy Resins, and Stoner Urethane for Urethane Resin. Using products not designed for your particular resin, such as oils or waxes, may affect the outside of your resin cast in an adverse manner. Stoner is the only brand we have found that formulates for the type of resin you plan on casting, which helps to produce better casts as well as save your mold wear.
If you have any other questions, we are available most evenings and weekends to help. If you don't know what tube-in mold series to buy for your chosen pen kit, call or send us a message about which kit you are looking for help with casting.