I am planning on getting a 3 step paint correction and buffing the piano black B-Pillar to get rid of swirl marks/Scratches on two of my cars. I have a silver 2009 BMW (waxed and clayed at least twice a year and garage kept) that was "paint corrected" almost 1.5 years ago. I paid the guy $200. Brought the car home the same day, direct sunlight hit the paint and I still saw the swirl marks. Then I have a 2018 Mercedes E-class in a very rate brown color(waxed a few months ago and garage kept since I brought it) that I brought from the dealership last year. Of course, it was ran through the dealership wash since the car washes are free. I am planning on getting both cars paint corrected, getting the gloss black B-pillar trim buffed and for the Mercedes, the rosewood gloss wood trim buffed along with the piano black center console trim. I have a few concerns before I go ahead and have both the cars paint corrected. First is, the guy is charging me $45/hr to do the work. He said it'll take him somewhere between 9 hours or less to do each car. Is that enough time to do the job? The second thing that most worries me is, I was reading online and some articles were saying that paint correction removes a layer of the clear coat. Down the road, will I have issues with the clear coat peeling? Is there any other type of wax or sealant I'll have to apply after the car is paint corrected? The guy that's doing the job said he'll be applying a sealant that should last 1 year. Will I have to do any clay bar and waxing after? The last thing I am worried about is the swirl marks returning after 6 months. I don't want to pay the guy $800-$900 to paint correct both cars then find out the swirl marks are back. What would you guys suggest?