cleaning and painting my block

Seems to me all machining (and sanding?) should be completed before freeze plugs or cam bearings.

I used SPI Epoxy Primer and a single stage urethane. Cheaper and more of an engine paint look. I think you want to minimize the mil thickness so an additional layer of clear is working against you. But if you already have the 2 stage and it will hold up then I guess go for it.

My single stage paint discolored on the intake manifold crossover and the exhaust gasket heat shield where it touched the exhaust manifold. Other than that it's held up fine.