> The RTV I'm using (Dow Corning HSII) simply will not set up properly at
> temperatures below about 72 degrees.
I have read that this property can be used to de-air molds if you don't have a
vacuum pump. You pour the mold, then put it in the refrigerator or freezer
overnight. The bubbles migrate out during that time, and then you bring out
the mold and let it set up.
I haven't tried it; perhaps someone else can give testimonials (or warnings) on
Albuquerque, New Mexico, USA
Small-scale live steam resources: http://www.nmia.com/~vrbass