I have a vacuum pump and chamber, but mostly use urethane rubber that I do not vacuum. Is there any advantage to vacuuming my urethane rubber before pouring?
Posted on 7/28/2014
Although urethane rubbers are low in viscosity and generally do not need to be vacuumed, they do contain air and you will benefit by vacuuming the urethane rubber.
General Rule: If you are fortunate enough to have a vacuum pump and chamber, use it for best results.
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