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I have been working in the paint shop for over ten years so i have done alot of buffing. On new paint I wet sand the areas I want to sand with 2000 grit sand paper(use alot of water)then I like 3M's perfect-it 2 compound. Not as grity as some of the other compounds but takes out sand scrathes pretty good. Then they have a polish (perfect-it 2 also) that works pretty good. They have a polish for light and dark colors. They both come in a black bottle. White top for light colors and a black top for dark colors. Use a wool pad for compound and a black foam pad for polish. Most buffing compounds are not supposed to freeze so buffing in extreme cold temperatures is not a good idea. I use this same system for old paint as well. If you dont want to use to compound, the polish will shine up old paint decent but wont take out to much of the scratches. I always put the compound directly on the area you are going to buff and then spread in with the buffer before turning it on . Your preference i guess. Then buff in a area about two feet by two feet and keep the buffer moving. Stay away from the edges. If you have to get near the edges, tape the edge of the adjacent panel and keep the rotation of the buffer wheel spinning away from the edge of the panel that you are buffing. This will help to keep the buffer from catching the edge. You can do the same on style lines. This is just how I do it but everyone is different. It has worked for me . Hope this helps.
 
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