Hi, I've just started building models again after a substantial break of about 40 years. I completed my list of stuff I'd built up over lockdown and this seemed like a good idea and enjoying it a lot. I had a go a quick starter kit and loved it except for the paint which was terrible to apply by brush. I invested in an airbrush and things are going a lot better. Which leads me to the question...
I'm building a 1:24 car model and have painted the bottom of the chassis with Mr Color flat black using an airbrush. Took me a while to get the mix right on some test pieces but settled on 1:2 paint to thinner (same brand as the paint) and after a couple of coats it looks lovely. I then painted the chassis legs body colour (white) using Mr Color white thinned 1:1 (it felt right) and then brushed that on. What happened was that it looked ok but then went grey as I brushed. I'm guessing that the thinner in the white paint lifted the black base which mixed with the white to create grey. Any idea what I'm doing wrong and how I can stop this happening?
Many thanks,
Mark