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RT413 - ilaking a brush-on skin mold Step 1 Prepare the...

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Unformatted text preview: ilaking. a brush-on skin mold Step 1. Prepare the original. Step 2. Paint the original with a thin precoat at base and catalyst mixture. This coating should be applied by brushing, and. to ensure a void- iree coating, the mixture should be tie-aired prior to use. If air bubbles form during application of the RTV material. break them with a light air spray or by hand. Cure at room temperature until the surface is tacky. NOTE: increasing the ratio of the cata- lyst to base will accelerate curing so the coating will become tacky much faster. This also will result in a thicker skin layer on the original. Prepare a mixture of thixotropic. material fol- lowing the instructions supplied with the product. Thixotropic Material Step 4. Using a brush or spatula. cover the precoat with a 1/4- to BIS-inch layer oi the thixoiropic coating. ii the original is large. it is advisable to prepare the thixotropic coating in several batches. applying it to one section at a time. NOTE: To smooth the surface of the thixotropic coating. dip a spatula in DOW CORNiNG 200'” tluid. 50 cs. and groom the surface. 0r wet a wash cloth and tap the surface of the skin mold to tiatten the peaks. (The extra moisture will aid in the cure of the tin- cured rubbers.) Cure tor24 hours at room temperature. Sup- port the skin mold with a counter mold of giass-fiber—reinforced polyester. plaster or urethane foam. - Continued on next page Step 6. Carefully remove the counter mold and place it securely on a horizontal surface. Step 7. _ Peel the rubber iron: the original. Step 8. Realzsemble the silicone mold in the counter mo . E'E} Silicone Moidmaking Material Thixotropic Material ' E ...
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