I use a paint gauge daily and look for 2 things:
A: If the paint is too thin, I know it has been cut/compounded to a dangerous level and will not stand any more heavy compounding.
B: If the paint is too thick, I know it is a re-paint and will probably behave differently to compounding and polishing. This is especially true of German cars with ceramic or hardened clear coats. Repainting can't duplicate that process so the paint will generally be a lot softer in the repainted panel.
The gauges are good insurance for a detailer. Most run from $400 to $1,000 for a top of the line.
Toto
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