I've started building the Ghostbusters Ectomobile (from the original movie), and something weird has happened to the paint, as you can see below. This has never happened to me before, so I don't know WHY it happened, or how to fix it. I'm assuming I can just sand it back and repaint, but I want to make sure the problem doesn't re-occur. Any advice on the cause and/or corrective action would be greatly appreciated.
To help with the diagnosis, the body was primed with Tamiya grey primer, and then coated with TWO mist coats of Tamiya Pure White (acrylic) which went on perfectly. It was when I applied a wet coat that the issue happened. I painted outside using a rattle can, where the weather was warm (not hot) but maybe a bit humid.
Please ignore the fact that I put white paint on grey primer.
The issue is just above the wheel skirt: Here the problem is on the top right of the hood and in the panel line: