#1: Remove as much rust and debris as possible with a coarse abrasive or grinder.
#2: Degrease with a solvent-borne degreaser such as WIPE#6 or System 20.
#3: U-POL recommends 2-3 coats of Epoxy Primer for a maximum anti-corrosive protection.
#4: Allow 10 minutes between coats.
#5: Once cured, apply RAPTOR. You can go wet-on-wet (no sanding) within 1 hour.