Originally Posted by DrCharles
I can't speak for the OP, but I definitely used Grease & Wax Remover then a rinse/wipe (think it was brake cleaner).
Yes, surface prep is usually the most common cause of paint failure, but I knew that and followed directions whistling
I suspect the machine shop sprayed some kind of gray coating or paint on the block to keep it from rusting. Where the paint has come off in big sheets, there is hardly a trace of rust underneath. Maybe I should have sanded first! shruggy


It may have been exposed to some sort of contaminant like silicone ( think lubricant overspray) and that can be a real problem to get rid of, especially on a porous surface. Sanding typically would only spread it around. The only other thing I can think of would be to use a metal etch solution. beer

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