- (a) The entire underside of the bus body, including floor sections, cross member, and below floor-line side panels, shall be coated with rust-proofing material for which the material manufacturer has issued to the bus body manufacturer a notarized certification that materials meet or exceed all performance requirements of SAE International J1959.
(b) The undercoating material shall:
- (1) Be applied with suitable airless or conventional spray equipment to the undercoating material manufacturer’s recommended film thickness; and
- (2) Show no evidence of voids in the cured film.
- (c) The undercoating material shall not cover any exhaust components of the chassis.