We've got a problem here, where we're hand spraying a urethane conformal
coat on over a rectangular inductor.
The inductor body is a plastic tube, with potting to fill.
The top is not always flat (sometimes concave).
The problem is that bubbles appear in the conformal coat on the potted
surface, sometimes right after bake and sometimes days after.
Any ideas on what the root cause is and how to prevent the bubbles?
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