maybe this thread is dead, but i was just reading, and if anybody wondering; often times most enamels will have a minimum re-coating time..say " do not recoat for 48-72hrs" if last coat has dried for a certain period of time. it is exactly what you thought sam mac...this is called alagation or alligator..previous coat may not seem wet, and even dry, although uncured, and as the coat on top starts to cure, it reacts and shrinks..enamels take along time to cure as opposed to uerethanes, laquers and such...when working with enamels i tend to do all my top coating in one day...im no expert, but have been "squirting" for about 15yrs..if this helps at all.
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