I am using Smooth-On products as well. I've used both the OOMOO and Mold Max products for the molds. For the plastic I'm using Smoothcast 325 Colormatch, which is amber in color with no pigments added. I have not baked my molds and haven't had a problem with bubbles.
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Brian

-See my empeg <a href="www.hulkster.net/empeg" target="_blank">here</a>-