How do I keep a two part mold from bonding together? Monica P. March 03, 2020 14:37 A. We recommend using Vaseline for two-part molds. Related articles How do i figure out how much Silicone Rubber to buy? Tips for using Envirotex Lite Epoxy Coating How do I fix my tacky and gooey surface? Which Mold Making Product would you recommend for making large Molds? Comments 0 comments Article is closed for comments.