Hope someone can advise me on this one. I bought a bottle of the vallejo light grey model colour paint, thinned it with acrylic thinners, sprayed it on my latest project and ended up with what I can only describe as 'rust' streaks in the paint coating. At first I thought it was moisture from my compressor as it looks very much like that, but on reflection, I don't use my airbrush often enough to warrant moisture build up. There is a moisture trap on the airline and I check it regularly but there is no significant build up of moisture.
To get me out of this problem I will have to respray with primer and then use good old humbrol enamel.