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Wet sanding is the most aggressive way to remove scratches in the finish and should NOT be attmepted unless you know what you are doing. Sometimes this is nessesary, procedure here was 3000 grit, then 2000 grit, high speed rotary with Meguiars Heavy duty cleaner, followed by fine cut cleaner, then dual action cleaner polish, switch to DeWalt 443 with SSR1 polish, then my sealant.
 

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1991 Deville / 1989 BMW 635csi
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i do auto detailing and polishing and 1500 grit wet is enough for fine abrasive, then ultra fine abrasive, then finishing polish, then wax. Then u will be done. DO NOT ATTEMPT TO DO YOURSELF!!!!! IF U RUB THROUGH CLEAR YOU WILL BE TOTALLY SCREWED!!!! A soft rubber block should be used when wet sanding for polishing to remove the highs in the clear.
 

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Yeah, I must admit, I can't say I've ever used such fine paper for wet-sanding. I usually start with something around 1200-1500 and polish from there. There's nothing wrong with being conservative, I guess I'm just lazy or the guy that taught me years ago was.
 
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