I'm with Joe when it comes to heating..I think your problem with bubbling is possibly with handling during the process from sealing to finish with epoxy. If the plug is not clean you will get bubbling especially with the epoxy. If using e-tex, I am assuming you are using a propane torch and passing the flame under the plugs after epoxying. I usually do this after the plugs are all on the spinner and the epoxy is setting up.
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