i used 1000 1200 1500 and 2000 grit wet and dry before hand and the surface it perfectly flat and all the same dullness
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Then you went straight to 8,000? How long did you sand for. It really sounds like you still have 2000 grit scratches left, but a pic would be nice to see also.
EDIT:Even with MicroMesh, I would still buff the paint out with compounds, regardless.
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i sanded with 2000 for ages and its all flat with hardly any scratches visable i men you can see where the paper has been but there arnt any noticable scratches but when i start to buff it up i looks reflective head on but at an angle you ccan see lines when it has been rubbin
+ do i have to use it wet or dry iv tried both but im not sure wich is best