Not if you don't need it, no. I buy the Hobby mold 160. And bought a pattern release spray for 2 part molds. Wax is for sculpting and recasting existing pieces to sculpt. the mold release is uneccessary, if you are just casting plastic figure parts you won't need it because plastic isn't porus enough. if you feel you need a release agent you can but that stuff, but a light dusting of talc powder will work just as well.