OK, I need little feedback please....
I put the first coat of Polyscale Acrylic Light Blue on it yesterday over the Tamiya acrylic white and....

The wings appear ok, it's just on the fuselage. I've never seen that happen before. I've reduced the pressure on my compressor a little as i think I may have had it too high, but it still doesn't explain why it should crack like that - it looked fine as I applied it! Is it just the Polyscale paint? I don't think there are any edges to be sanded down, although I'll probably give it a light sand just to be sure, then I'll respray with Tamiya mixed per WNW proportions.
Ian