I bought a glass pack in some beautiful colors but it had a lot of seeds in it, so I fused everything upside down, all the bubbles went to the back pice of glass and dissapated, after I cold worked I slumped it right side up and thye all turned out really well. So I know do this with anything that looks like it might want to bubble.

I have also done this with pieces that had bubbles show up out of nowhere, I simply flip it over and full fuse again.  It does not work on all bubbles but they do seem to head for the back so that the top is smoth.

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