Anyone painted por engine enamel over ceramic or previously painted surfaces?

[special-K]

I wouldn't expect it to work out well with scuffing it with all those nooks and crannies. It'd sandblast it off and pressure wash the crap out of it to get all sand gone. I don't think there is anything to chemically etch the ceramic. I think stripping will make a mess... and it would require grinding through to get under it. I'm surprised your engine guy didn't suggest glass beading. That would seem to be the best way to "scuff" and go over the solid foundation of the ceramic. I think I'd do that over attempting to sandblast. But maybe sandblasting at lower pressure would be the thing to do.