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Unread 03-16-2013, 02:53 PM   #14
verdatum
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Grinding up cured silicone to use a filler does in fact work, but as you discovered, it needs to be similar cure-type. Additionally, you want the silicone to be as clean as possible.

Vacuum degassing after mixing everything up is also a really good thing to do if you have the resources. Small air-bubbles like to cling to the chunks, weakening the mold.

I have a 5-gallon bucket full of dead molds and flashing scrap. One of these days, I'm gonna buy an old-timey meat grinder and use it only for grinding up junk silicone.
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