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I had a local detail shop apply Jade Quartz ceramic on my C8 5 days ago. I got the car home today and notice a 4by3 inch spot on the right side of the hood. It is under the coating and will not rub out. What is the correct repair procedure? My first ceramic job and I do not want them to make it worse?
If it is indeed under the coating, the only way to get down there again is to remove the coating in that area, by compounding it off. Then you would address the issue, and resolve, then recoat the area.
I'm lead to believe your detailer did not do proper paint correction before the coating or else he (with his professional trained eye- in theory) would not have missed something that you clearly saw.
Either way, I'd expect him to make good on this and not charge you anything. Again, this is assuming he mentioned he would do paint correction before applying the coating which is something that 99% of pro detailers would do.
If it's a darker spot, kinda like a smudge of un-buffed wax or sealant it's a 'high spot' where they missed removing coating residue. No big deal if that's what it is but they will have to buff it off, reapply coating. Generally redo the entire panel as some coatings don't take well to spot fixes.
Nothing damaging, just excess product they missed during removal and now is cured.
Or, its what's mentioned above by Loki-6. Either way, take it back, have them fix.