I found a black spec on my white paintwork today that looked like a small dot of paint overspray. It had most likely always been there but I just never noticed. Clay did not remove it, so I proceeded to use CG V34 compound on a orange foam hand applicator. The black dot proved to be quite stubborn and I managed to removed the majority of it with the foam hand pad. I should have stopped and left it there but I made a rather dumb mistake of reaching for the microfiber cloth and putting a drop of compound on it and working it with my index finger, as a final attempt at getting some good cut at the remaining defect. I cleaned off the compound with quick detailer which revealed that the area was faintly darker than the rest. Yep, I believe I burned through the clear coat by hand compounding. At first I wasn't exactly sure on how it happened, as I was under the assumption my car was previously repainted in a single stage white. But now it's apparent that some panels still had the thin Nissan factory base/clear, which was probably already compounded down a bit from a couple body shop visits it had in the past. There is a possibility the area is just marred from the compound from what I searched, so I will try to take the DA to it with some finishing polish to see if it remedies it. Either way, if it's burned I have nothing to lose and a lesson learned first hand, literally. Any detailers here that can chime in on how common burn through is? How do you approach compounding/polishing when you or the owner are unsure of the vehicles paint history? Do you use a paint thickness meter before compounding a vehicle?