cheers guys, i have been going with 800 hand wet and dry before paint.. but a couple of ppl i have spoken to have said just to buzz with 400.. would having it too smooth cause the paint to run easier on vertical surfaces. I painted my 2 front guards yesterday and one has a couple of fairly large runs in it. They wernt there when i left last night when i left! should have laid the panels flat i think... they will block out i think but its still a pain