Painting cast iron Pro tip if you are going to paint a cast iron block, after degreasing/cleaning, hit the surface with a blowtorch to drive out moisture from

Painting cast iron Pro tip if you are going to paint a cast iron block, after degreasing/cleaning, hit the surface with a blowtorch to drive out moisture from the porous surface. THEN apply a primer, THEN paint with a brush. You're only going to do this once, do it right. Do not do what this guy did which was SPRAY paint a block holding on to a lot of moisture. This is exactly how you end up with cracking/flaking paint 2-3 years after a completed build.