Rust, if allowed to spread unchecked, can in time significantly weaken the structural integrity of the body. Bubbled paint, brown spots and holes generally indicate the presence of rust. K&h rust dissolver is a phosphoric acid based rust that chemically removes rust from iron and steel leaving a short term protective coating ready for priming and filling. It is suitable for all accessibe areas that are to be immediately primed or rust proofed. The trigger pack ensures economical application to the rusted areas and access to difficult to reach areas, and the 500ml bottle can be used as a refill or to brush on