I noticed that thicker DWP molds tend to create large bubbles in baits, even after baking at 300 for an hour and coating with Elmer's. I decided that this was due to moisture boiling off, so I bake them longer now. This appears to have fixed my problem.
I use LC plastic in a microwave, shake it like crazy before heating, and do not see the bubbling problem when I use Aluminum or RTV molds. I haven't tried the oven or pot method yet, but look forward to building a presto pot this spring, using all the great info from you guys on this forum.
Thanks,
Dave