Modeling, Molding, and Casting Question

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  #1  
Old 10-12-09, 10:27 PM
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Modeling, Molding, and Casting Question

I have to make a somewhat simple cast out of silicone to seal an akward gap in the bed of my truck. I have been trying to figure out the right materials to use. I need to make a beginning model out of something easy to sculpt, then make a mold out of that with something, then make a casting of that mold with silicone rubber as the final medium.

What mediums should I use for the initial model and the mold. I was thinking wax for the initial model, not sure what to use for the mold. Any advice would be appreciated. Thanks in advance.
 
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Old 10-14-09, 04:59 AM
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I make my molds out of modeling clay. Just the normal modeling clay that does not dry (oil based). Then I mask off the surrounding area. Coat the clay and several inches around with a release agent (vaseline) and make my negative mold out of fiberglass.
 
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Old 10-14-09, 02:37 PM
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That should get me on the right track, thanks.
 
  #4  
Old 11-04-09, 08:11 PM
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answer

Been a Artist and studied many things as bed liners and painte over 60.(1)can not paint over silicone use aelastomeric latex sealant. (2) mold with plaster of paris. (3) a release agent should be used, but if not available, use warm wax or rub mold down with such.Hope this works for you personaly I like to see prodject, sure seems you could fiberglass it.
 
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