There was a interesting article in the club magazine a few months ago on "metal sprsying". Looks like as our cylinder heads get skimmed and skimmed over 50 years - ultimately would be scrap, but they are now salvageable and can be built back up. They applied it in cars SOS last week (to an aluminium sump). For those interested here is an extended version of the process(on cars SOS Facebook page) I wounder how much it costs? I know my heads are heading that way.
https://www.facebook.com/carsosofficial/videos/260253992339846/
https://www.facebook.com/carsosofficial/videos/260253992339846/
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