Talc it and if you still get bubbles, just agitate the resin before it sets. The other parts are SAM2 bits, I moulded an entire kit a few years ago.
Leigh I can't recall the hardness rating for this stuff. It's reasonably firm. I should have moulded the inside as a separate piece because they're a sod to demould due to the taper, but eh, no seam lines this way.