Also keeps any casting sand from working out of the block.
Glyptal is wonderful stuff, I even have a quart of it, never had an engine that was special enough to put it on!

R.

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It's not to be used on alcohol. The paint can says so.

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Yes, you absolutely should not drink and paint !

On a more serious note, I would hope that ANY fuel I was running would not find its way to any of the places the glyptol is used !!!

Post deleted by moparts

Im a fan, I know some think its a waste of time, but the oil drain back is the main reason I did mine. Also keeps the valley cleaner so you can see at a glance if theres something thats not suposed to be there, Roller bearings, flakes of stuff, etc, etc...

Do it right, clean the block properly it should last and last.

After several seasons of racing and just now torn down for its third ring/bearing freshen up the paint looks like new with no chips or flaking.

painting an engine internally started in the '60's. back in the day we did it not so much for oil drainback but to seal the casting from silicon/sand and who knows what from breaking loose during thermal cycles. a lot of racers were using green blocks back then. back then there wasn't any thermal cleaning. everything was a hot tank and the iron had a dirty texture/light surface rusting. we also used the rustoleum damp proof red primer in a can and brushed it on to seal everything. this paint had lead in it so it's no longer available.

Not only does it seal in any casting residue it also seals the pores to keep the black soot that discolors the oil from being trapped in the pores and contaminating fresh oil after an oil change.

Other than cost/labor, there is no downside to Glyptal or Rustoleum Damp Proof Primer.