I just put epoxie sculpt in a tunas mouth ,i checked on it
in about a hour it has bubbles formed on the sculpt,
i put it over foam?
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wait until the as is almost set up and hit it with sandpaper or a small file to clean em up
Those are not bubbles I suspect you put a thin coat and there was some residual foam that formed bumps. If hard sand off as suggested or put another thicker coat on.