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1- 1 lb. can RTV and activator.A pourable mold rubber that vulcanizes at room temperature without pressure, RTV Silicone is a 0% shrinkage 28 durometer, condensation (tin) cure rubber that cures in 16 hours. While this rubber can render a wax pattern of exceptional detail, it can also withstand the casting temperature of most tin alloys, making it an ideal medium for prototype casting. A two-part mold can be made by pouring mold halves on successive days. When you need to reproduce a pattern that cannot withstand the heat and stress of vulcanization, RTV Silicone is the ideal mold rubber. Furnished in 1 lb. cans Activator packaged separately..Mix 10 parts silicone to 1 part catalyst. Please follow the ?NEW? ratio of 10:1 that is on the lid of the can.Instructions for using RTV Silicone 1. Prepare a box or simple frame 2. Prepare the object 3. Prepare the RTV 4. Pour the RTV 5. Separate the mold 6. To Reproduce Make a box or frame or use a container made from metal or a strong cardboard. Apply a thin coat of vaseline to the interior surfaces. Make sure the object is clean. Seal the frame to the base with a thin layer of plastilene. Place the object in the frame sealing the edge to the base with plastilene. Apply a thin coat of vaseline to the model. The catalyst must be carefully mixed into the RTV. This will make the RTV cure to rubber. Pour the catalyst into the RTV. Mix slowly and carefully. Slowly pour the RTV on the model, starting at the lowest point. After pouring, set on a level surface and leave for up to 24 hours. After curing, separate the RTV from the model. You will have a tough, flexible mold, ready for reproduction. Any of the following can be poured into the RTV mold: plaster, wax, polyester, epoxy resins, PU resins, wood pulp, reconstituted stone, some low-melt tin alloys. Making a Single Part Mold 1. Prepare a box or simple frame 2. Bedding In 3. Positioning 4. Pour the first half of the mold 5. Turn over 6. Pour the second half To mold an entire object you must make a mold in two halves. Put a layer of plastiline in the base of the box. Trace a half-way line around the object. Place the object in the plastine up to the half-way line. If the object is intricate or fragile, melt the plastiline in a container and pour it into the box. Make a few holes 3 or 4 mm in the plastiline to key together the two halves of the mold. Put in a small tube for the feeder channel. Coat with a thin layer of vaseline. Catalyst the RTV and pour into the mold, beginning at the lowest point. After pouring, set on a level surface and leave for up to 24 hours. After curing, invert the mold. Completely remove the plastiline. Put a thin layer of vaseline on the model and first half of the mold. Pour the second half of the mold. Set on a level surface and leave for up to 24 hours. Making a Two Part Mold continues… 9. Remove the molding 7. Separate the mold halves 8. To reproduce 10. Use over and over Separate the two halves of the mold. Lift out the model. Remove the tube used to form the feeder channel. Carefully position the two halves of the mold together. Pour the casting medium into the mold through the feeder channel. After the casting medium has set, open the mold and remove the molding. You now have a faithful reproduction of your original model. The mold can be re-used to make more reproductions. Many identical reproductions can be made from the same mold. The RTV mold remains durable but flexible. WE SHIP WITH SIGNATURE CONFIRMATION FOR OUR AND YOUR PROTECTION. THIS MEANS YOU NEED TO SIGN FOR YOUR PACKAGE. IF YOU WANT TO ASSUME THE RISK AND NOT HAVE TO BE HOME TO SIGN – PLEASE SEND US A NOTE AT CHECK OUT OR AN EMAIL NOT TO SHIP WITH SIGNATURE CONFIRMATION AND YOU WILL TAKE THE RISK.