as mentioned you can avoid the wet sanding but that doesn't mean you can't still burn through the clear. I've done this a few times by not knowing how much clear was still left on the car. I am not afraid to admit this because anyone who's really good at it will tell you if they are honest they did as well. you need to know if you have the original finish with the 2-3 coats of clear on it. Scratches through the clear cannot be buffed out. You need to fill it -build it up and the sand it down level. then mild cut and polish. Water sanding is tricky because if you don't use enough water you end up putting more scratches in then needing removal. Need lots of water and definitely will cut down on the job time. If you don't go that route, then you will need to do a 3 or 2 step cut and polish. Cutting takes out the harsh scratches but put fine ones back on the finish. A 2nd step is to remove those with a finer product and pad. Sometimes if you have finesse you can do two steps in one. with the same product and wheel. that takes practice and experience. but if you are looking for a better then factory finish? be prepared to use lots of elbow grease and about a days worth of work. it is very labor intensive. Anyone who's done some pretty rough cars will tel you this.
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