Paint Thickness Gauges ?

[BlackCoupe]

$00 for rent? Damn, I need to move....

Yea, a decent one of these goes for $1700, as I recall.

PosiTector 200 - Using Gates to Identify Changes

That is a link to a discussion about discriminating between layers, so you can tell the thickness of JUST the cleatcoat layer, and determine how much "roughness" (I guess this means the depth of swirls) there is on the suface. I think the model that "extreme-detail uses is around $400.