Brushable Chassis Paint

[Humps]

For many years I have used POR15 on all components requiring painting and always delighted with the finish off the brush. However, as mentioned by Ian, occasionally one would get the the cobweb of rust under the paint.
I don't know if I'm getting lazy or wiser, but now I just give everything including the chassis a couple of coats of Rust-Oleum direct from a spray can and it appears to provide a very resistant finish.