I wetsanded my car about a month ago. Half of the car had about 2 month old paint and the other half had about 2 week old paint. I used unigrit 2000. I used a pc on max speed with 2 different wool pads. I used intensive polish first. It did nothing to sanding lines. I then tried used pI-II and it still didnt get them all the way out. I then got pI-III RC it did a better job, however there are still sanding lines on my hood. You can only see them in certain light but they definetly are still there. I buffed the car 4-5 times. As I said I was on max speed with the pc and wool pads. Also, I was pushing with a great amount of weight. My wool pad actually came off the velcro pad. For me it was worth because my paint job was terrible and each time I took it bad it was worse. I will probably go back and try some more later but after day upon day buffing after spending day upon day wetsanding I needed to stop and take a break. You may want to try a small spot and see how it goes. I did that first myself and I did see any lines. However, when I did the whole car there are some.