I like to take a reading of the inside of the gas cap since it has so little film, to help me make an educated guess about how much CC i might have to work with.
Anything below 4.0 i`d just compound lightly and not as much as the rest. According to your drawings, looks like it`s just the lower areas of the vehicle so that`s better than having low readings on horizontal panels. Let the customer know about this, he`ll appreciate you taking the time to take thickness readings and respecting the health of his CC, instead of just thinning the crap out of it and letting him deal with failure down the road wondering what happened.
When placed on the bare metal coin, it should be at 0.00 , and use the provided films to test the accuracy as well. Excuse the blurry pics, i just took them quickly (one with the film and one with just the bare coin).
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