I also have the same question. I just bought black oil based paint (normally comes in paste) I read some forums that you can use oil paint for weathering the engine block, panel lines, etc.
first I mix it with some thinner, and then I brush them on the panel lines then I rub the excess paint using tamiya compound, but my body ended up very dirty with black mark around the panel lines.
what did I done wrong ? how to clean the black mark from the oil paint, I already use compound but still comes up dirty.
thanks.
cbreeze, sorry for using your fourm since I have the same question.