HOW TO MAKE A TWO-PART RUBBER MOLD OF A COMPLICATED MODEL You are on page 5. Go to page: 1 2 3 4 13) Use release agent on the mold surfaces, and allow it to dry. Pour in your casting material, and allow it to set. The casting material will rise up into the air vents and will need to be trimmed off. A pair of side-cutting pliers helps trim the air vents and the filler connection easily. In the photo shown, more casting material than necessary was used. We only needed enough casting material so it would rise above the level of the horse’s hooves. (As a matter of fact, we only needed to make the funnel and the mold extend a little beyond the horse’s hooves.) Each time you make a casting, make note of how much material you actually need, so next time you don’t use more than necessary. 14) Most castings will have some flashing that needs to be cleaned off. Using a sharp knife with a scraping motion (not a cutting motion) gives the best results. Tip: Save the “funnel” made where the casting material solidified in the fill hole. You can use this as a ready-made funnel pattern when you make other molds. Materials used in this project: Moldmaking rubber: “Por-A-Mold” medium hardness S-333 from Pathway Polymers. Release agent for rubber against the model: “Synlube 531” from the same. Release agent for rubber against rubber: same as above. Release agent for casting material against mold: same as above. Casting material: “Alumilite” regular from Alumilite. Clay: “Klean Klay” from Art Chemical Products. Many other supplier addresses, phone numbers, and web sites are in the Castcraft Source Guide. You are on page 5. Go to page: 1 2 3 4