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rukee
ive seen similar problems many times in the past like this
some are from having lacquer as a bas and even when sanded dowwn it looks ok to shoot over but when new paint hits the surface it actually melts the old paint,,thats where you get most of your adhesion at.
this also will open up any imperfections in the underlying material.
did you use a paint that had a hardener/catalyst with it?
if not the first coats take much longer to cure
also do you know if there was a good quality sealer added before painting?
this can be a necessity especially if the older paint is of a lower or degraded quality as it seals and helps to keep your sanded finish for new paint
i think the reason you see it change and almost go away is the sun is heating the metal ,,,thus causing it to lift away from prior coats.
one other possibility is if a prep cleaner was used prior to painting,,it will actually leave almost a oily residue on the surface causing the paint to go crazy in the wet areas,,,almost like you see streaks like as if you brush painted your car
at any rate the only way is to remove and repaint but i would still make sure a good sealer is used and especially a paint with a hardener / catalyst is used
dont do like i did and painted single stage with no hardener and then got radiator fluid spilled on it from a overhead several months after painting it and it still left little rings in my paint
good luck
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