Bit late to the party here.
Without a doubt sounds like a contaminated batch of paint. You could ask if they have had issues with a batch, should be identifiable from a code on the base of the can. Aerosols do have issues every so often. Is there any chance you can post pictures of the overall shell and also close ups of what it's done so I can see. I have a theory but without seeing more I can't tell.
The bottom line is I think this is an unfortunate error which is more than likely nothing do with you. Tamiya won't refund and the model shop won't either. I had this myself back in early 2002 when I did a Tamiya shell. In the end after the shop and the importer being zero help I had to get another shell out of my own pocket. Luckily the other model shop I went to were helpful and even gave me discount and subsequently got all my business from then on.
Will wait and see if you post anything else so I can have a look.
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