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you certainly could. never the less, the fact is that there are multi layer paint gauges on the market that will read automotive sheet metal. I've just contacted olympus, as it it looks like they do...

well i did say they weren't cheap lol
at least we know the technology exists.

As a rule of thumb anything under about 100um is starting to get down to the wire, but as the guys have already said, it varies from vehicle to vehicle. I've taken 3 stage paint down to 87um on my...