Do they make any kind of industrial paint slathering for the outside of these porous aftermarket blocks? Whoops, did I say that out loud?
Makes me sad to think I have a FAST build coming up and a truck puller and need to buy at least one more.
Do they make any kind of industrial paint slathering for the outside of these porous aftermarket blocks? Whoops, did I say that out loud?
Opening another can of worms here 
. I use 3 coats PPG Epoxi primer outside the block to seal the pores
not sweating of oil or lifted paint for many years. And i also grade of all sharp corners beacuse the paint tend to creap away
from sharp corners. And thats on porous stock blocks never had an aftermarket block and probably will never have one
When I do the concours paint, I use PPG JP375 primer, thinned as their instructions to use as a sealer/adhesion coat not a surfacer. I just have no desire to go back and sand and it would look wrong for a concours build. Tricky thing on 375 is you have to let it sit in the cup or gun for 5-10 minutes (depends on whose instructions you use) for the hardener to activate before spraying. However, most guys like to mix and go, myself included, so I have to walk around the shop, comtemplate life, wipe it down again with a tack cloth, etc.
Of course I did paint this one with bare metal under the water pump
but note how the bypass hose, stainless clamps, PCV rubber lines, all get paint if you did it like the factory did.
This one was bare iron, cleaned with cheap thinner, then PPG grease and oil remover, then tacked, JP375 (which is also an etching primer), then 15 minute later topcoat with PPG single stage urethane
