I concur with what Wobbly said - the HPC coating is very effective and I have used it in a number of applications to (marginally) reste piston/bore clearance where the old piston was sound but undersize, correct errors where restores have been bored/honed just that little too big and as anti-eizure protection. I have found the coating to wear a touch, but ant-sozure protection has been excellent - have never seized a coated piston (and (insert preferred divine entity) knows I've tried..)
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