Regarding the blotchy color coat and uneven metallic...
You may be able to mitigate this problem by spraying the first couple of clear coats VERY dry. If the first coat(s) of clear go on too wet, they tend to dissolve the color coat and re-float the pigment/metallic. Spraying the first few clear coats dry provides a buffer between the color and the subsequent clear coats. I'm not a professional - I've just learned from personal experience.
I can also report that Pelham Blue Flying V will turn a very curious aluminum color if you spray a heavy coat of clear over it... but it's easier to do the second time.



