I started with the yellow which requires a silver undercoat. The silver applied smoothly, flowed evenly and created a beautiful finish all its own. I should have stopped there. The next morning I started painting the small partsnwith "Hi-Po Yellow." .The paint was viscous and pale. Much paler than the sample card, but much closer to John Deere Ag Yellow than I expected. The first coat was thin and translucent, not hiding the primer coat of silver. Worse, it was simultaneously drying too fast to allow the paint to flow and even out brush strokes; yet flowing too much causing drip marks.
Painting any of the small parts hung up on a makeshift rod was like trying to make a peanut butter sandwich with the bread hanging on a string. It was long, tedious, detailed work that wasn't coming out right.
I was only thankful that the machine shop had painte dthe block black, causing me to abondon my plan to paint it yellow. Still, and in spint of m experince with the yellow, I prepped the engine for black.
Black was a revelation. It went on easily, covered in one coat. Didn't flow fast enough to cause drips, but just fast enough to fill in brush strokes.
The end result, an engine block that looks like a wet piano, even when it is dry! A real pleasure to use and much better experience than the yellow.