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Thanks for the advices guys, I will try to paint with brushes.
BTW: I will try to do an Polished steel "undercoat". I will use then 80% paint (Olive drab) and 20% thinner, for a sort of "overcoat". A tank is made by steel, why not paint it by steel?
I think it's not a great idea!
for one: you are adding more coats of paint, so that could cause problems
second: the color of plain rolled or cast steel is probably not polished. I bet it's more of a grey black color. SO if you used a very dark grey primer that would serve the same purpose.
third: isn't polished steel likely to be an enamel? Painting acrylics over enamel in a large area can be a problem according to some (I've never tried it).
So if you are talking about a dark grey primer coat, I think it's cool, otherwise it's risky.
Of course, it's your model!!! :-)
Cheers
Andy