70's AS asphalt-based frame paint prep for POR-15
Have now spent 10 hours with an air powered rotary cut-off tool cleaning rust and old paint off frame, crossmembers and outriggers. This 1973 trailer has a asphalt-based paint on frame, after a few hours my hands looked and smelled like I'd been handling hot asphalt like they use for repaving highways. This stuff has an almost creosote like composition - the splatter fogged my goggles and stained my face walnut brown.
POR-15 recommends using a potasium hydroxide based degreaser, they warn (and I agree) using any solvent based degreaser carrys the film into the pores of metal and thus weakens the POR-15 bond.
I know some oven cleaners and driveway dregreasers have the KOH ingredient but no way will I hose the plywood down with water to degrease the stringers. My best guess is scrubbing with w/ damp cloth imbued w/ KOH and then sopping wet towel wipe and then a 90% isopropyl
($7 a gallon, wallmart) final rinse w/ compressed air dry.
Anyone have a good suggestion for this stage of my shell-on belly & frame rehab? I will be painting later today, weather taking a major turn for worse here in Minnesota...