what is the specs on your buffer? it may be a speed issue. also a few of us on this board do not use brown on alum. we just sand to about 600-800 then wheel with spiral/black then loose/ white. as for clean up between steps that is needed. i use simple green and hot water or brake clean. also if you can get a pic of the problem to show what is happening that would help loads.
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when in doubt polish it out/ why replace it when you can refinish it
G2 Polishing and Powdercoating
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