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Dave is right, and one of the things that I thought of when I seen those pics was solvent flashing off. Every time you spray a layer you actually re-solvenate/attack the layers below if everything is compatible. If you trap solvents like that then you will have problems later on. This was one of the things I had a problem with a few years ago and ended up hiring a coatings consultant to review my processes and make suggestions of a better way to do it. My particular problem was coming from the sealer/primer stage.
Two ways to paint...wet on wet is best for some stuff, or let each layer dry and then another coat. You'd be surprised how long it takes solvent or latex paint to dry with multiple coats. Either way you have to let it dry alot before the topcoat.
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