It's excellent paint. If you look cloesly, the 'grime factor' is the forensic evidence for the time-line, the valley pan, the long-term mico-seep of gas from all the 55 gallons of gas dumped down the secondaries, around the bolts, at the edge of the cast-flashing and the npt plug in the last photo. (blocked crossover) Of course surface prep is key because nothing will stick to rust and grime.

I treated the intake with electrolic reduction, because I didn't want to erode the cast flashing, and it's still so sharp that it will lay your fingers open. It came out excellent; even so, I spent mega-hours on the intake and over the entire engine with an assortment of wire brushes on a drill. Next, I kept flushing the surface with k-1 kerosene, then I let the kerosene sit for a couple of months until it was clear and burned it in my kerosene heater. Then I flooded the surface with thinner.