If you've used silicone putty, you spent too much money. For less than the price of one silicone putty mold, you can get ImPRESSive Putty and reuse it. ImPRESSive Putty MIX has ALL the same characteristics that make ImPRESSive Putty a great molding material except you have to heat and mix it before your first use. The ImPRESSive Putty MIX works really well with many casting materials. Here's a partial list: --Polymer clay and clay, air dry clay, modelling compounds --Soap (hot melt, cold press, heat & pour) --Wax (soy, paraffin, beeswax, candlewax, crayon wax :)) --Resins: Room Temperature cure epoxy resins, urethane resins (also known as polyurethane) including the fast cure ones for pieces less than 4 cubic inches --Low melt metal (Wood's metal) --Polyester resins-Bondo, fiberglass resin We don't recommend the Putty for plasters or concrete. Use the ComposiMold and Plaster Additive for plaster and cements. To use the Putty for the FIRST TIME 1. Place all of the ImPREssive Putty on a microwave safe dish or wax paper. 2. Heat for 130 seconds and immediately stir while hot with a spoon for 30 seconds. 3. Place back in microwave for 130 seconds and stir for another 30 seconds. 4. Do this one more time, 130 seconds, stir for 30 seconds, CAUTION HOT! 4. Let cool for about 20 minutes (be sure the putty is cool enough to touch but still warm). 4 Knead until UNIFORM color 5. Press your putty over your object 6. Place mold in the freezer for 20 minutes until firm to the touch. 7. Remove object and cast your duplicates After this first mix, next time you use the Putty heat it for 130 seconds, let cool until you can handle it (10 minutes), knead it, and PRESS over your part. Repeat whenever you want to make a new mold.