| JP,
It may be the plastic!
My son was attempting to paint a car shell using car type spray paint but was constantly getting blooming or some other imperfection, even stripping the whole thing back to the original surface and treating it with 1200 wet/dry made no difference.
He had not treated the shell in any way different from many others, but this was the first to display these tendancies.
I would try a test on some of the sprue to see what happens.
J. |