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Dave Parvin
Joined:
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16-Mar-2005
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Started On : 31-Jul-2009 at 09:48:16 AM, #Views : 5895
Topic Subject : Mold and Runnels and Skin |
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I guess living in a dry climate, Denver, has a mold advantage. While I do not use plaster, hydrocal, cast stone, etc. as a final casting material, I usually make my initial castings in Regular Dental Plaster and have some which have been in storage with no particular care nor sealing for twenty years with no mold. I can offer an easy way to dry plaster. Use an automobile for the greenhouse effect. The heat is free and very effective while not being so hot as to damage the plaster. Also effective for speeding up the curing of silicone rubber molds, esp. platinum silicones.
As for runnels, I agree that drying excess water from a mold is effective. I usually use the low setting on a hair dryer or compressed air to be a quick solution. However, there is another culprit, I have found that excessive vibration to remove bubbles can cause some water to concentrate into runnels. But whatever the cause, while the plaster is still liquid, if you horizontally rotate the mold in a circle about a foot in diameter very quckly as if trying to spin the plaster it seems to do two things. The first is distroy any runnels and the second is to drive the plaster to the sides of the mold forcing any remaining bubbles to the inside keeping the surface more bubble free.
As for rebuilding skin texture, i discuss this somewhat in my second article on making secondary molds. Included is a trick taugt to me by one of the masters, Guy Louis XV. The article is on the first page of the ALI Library.
Good castings to all. Dave.
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