Dulux AutoSpeed DP 42 Epoxy Primer is a two pack epoxy- polyamide primer. Dulux® AutoSpeed® DP 42 Epoxy Primer is easy to sand. The top coat may be applied after 2 hours without sanding. The primer may be sanded prior to application of a topcoat if left to air dry overnight. Suitably prepared surfaces: Sound existing finishes, Steel, Aluminium and galvanized surfaces, and Fibreglass.