Wash the trailer with dish washing soap. Scrub with a semi-abrasive scouring pad to remove the grease and grime.
Rinse the trailer with clean water.
Put on the safety goggles. Remove all loose and flaking paint with the sanding block and 240 grit sandpaper.
Wash the trailer again with soap and water. Rinse well.
Dry the trailer in the sun for several days prior to painting. Wipe the trailer with clean rags.
Tape all the areas that you do not want to be painted.
Apply the aluminum oxide primer with the soft bristle paintbrush. Allow the primer to dry for 24 hours.
Apply the first coat of paint with the soft bristle paintbrush. Allow the paint to dry for the time indicated on the manufacturer's label. Apply a second coat of paint.