Is anyone aware of a coating that can be used to seal the inside of water jackets? Seems to me this would reduce rust formation and eliminate perosity issues while improving flow at reduced tempatures .

You might try Glyptal. It's used in electric motor shops as an insulator, and stands up to some pretty nasty conditions.

I was thinking about "sloshing"( a term used to coat aircraft wing tanks with epoxy) to strengthen a head I'm working on It's the third one I've ported and each time I seem to get a little more cocky, this ones got to be getting thin in places. What I'm worryed about is a possible insulating effect? causeing the head to get hotter? any body tryed this? and what material did you use? thanks Bruce J.

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Glyptal helps with electrical insulation, but I'm not sure of its thermal insulation properties. Heat in electric motors is a big issue, of course. I have heard of some V8 engine builders using glyptal in the valley to help oil drainback. Just an idea!