Marc - that looks a lot like it was caused by an oily surface. I have had the same thing happen, ironically on another Trumpeter kit, the HH-65 Dauphin. I ended up buying another one and using Simple Green on it (kind of like Castrol Super Clean) and got decent results, but it seemed if I left it for more than two or so days the surface looked oily again, maybe its the plastic itself and not the mold lube that is causing it? I seem to remember someone commenting on some asian and eastern european companies using cheaper plastic and it 'sweating' oils after time... (oils would seep from the plastic I guess and make the model greasy again.)
On the same note though, I have also bought bad MM paint before too... mainly at one LHS that I vow to buy bothing but kits from again (Ok maybe alclad, but thats it! no enamel paints!), I think he doesn't rotate stock. One bottle while not exactly like your results, really didn't cover good and left an uneven surface to the paint, almost like bubbling. Another bottle clogged my airbrush and ended up flowing back into the body of it... Is this the first time you have used out of this bottle? I have heard other people here have mixed results due to batch variations in MM as well...
Hope you have better results... I've been enjoying your build in the Germany BG...
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On the mineral spirits subject, I had somewhat similar (poor) results with different mixtures. At $5.00 a bottle at Hobby Lobby I'm sticking to the MM thinner for painting and mineral spirits for cleaning. As little as I spray enamel nowadays it's worth it!