Hey Travis, What was the phase of the moon the night you made your
With that aside, try your oven at 320 F, and leave it in for twice
as long (1.5 hours). The reason for this is that you're relying upon
air to heat up your mold plates/frame, as opposed to the direct hot
metal platens of a vulcanizer. Essentially, air, being at the same
temperature as metal, has much less energy than the metal, which is
why you're getting incomplete vulcanizations.
NSP is not nearly as forgiving as many mold-making materials. I
would attempt it one more time (or two) using these guidelines - or
I've never tried this in an oven before, so you'll have to take it
at face value.
If I were you, I'd make an RTV (cold mold) mold, and not expect NSP
to produce 0% shrinkage.
Matt Feliksa President Golden Sun MFG., Inc. "Specializing in platinum
casting to the trade." www.goldensunmfg.com