Thats just what I want mate. It already been done with a light grey, slightly rubbery (?) type paint. Not sure if this is a sort of base coat or something? All I want to do is re-paint over the top with a brush like you say, so should be pretty easy. Im not after a bodywork-like finish either so not a problem.
Cheers, Rich.
thats factory rubberised underseal mate, looks like it has been painted in a grey primer, thats what my cabby has got all over the floor pans. would look nice all gloss and shiny