I’m working on an F-104 and yesterday sprayed the nose in two colors (both Polly Scale acrylic paints) over a primer of Tamiya black that I applied a week ago. One color, the green, came out well, but when I sprayed the gray, it cracked (rather spectacularly, as you can actually see the black primer underneath). I sprayed the same gray Polly S paint on the wings without a problem a few days ago, thinning it both times with Testors acrylic thinner (which Testors specifies as the correct thinner for Polly S acrylics). Does anyone know what could have caused the paint to crack so badly? And who only on the model itself (if you look at the overspray on the masking materials, the paint laid down beautifully there)?
I’m going to sand the gray off and respray the nose, but wanted to know if anyone knows what went wrong so I can avoid it moving forward.