Goop does not develop air bubbles over time, this only occurs during the curing phase, once it is cured it is stable. The air bubbles come from chemical outgassing and usually indicate too much Goop was used, or you had contamination on the mating surfaces. Clean everything with alcohol. You want a very thin layer of goop if you use that method, sound doesn't travel through a thick layer of goop very well even if no bubbles, it will actually become an attenuator.
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