For wet & dry nothing under 800 to start with otherwise the finish disappears really quick. For subsequent wet sanding suggest using 1200, 1500, 2000 and buy some micro mesh Pads to do the very final sanding that goes through 4000, 6000, 8000, then 12000 before you add the car polish. Here is a shot of the stuff. Had to buy finer grade wet & dry paper at an auto shop - Autobahn which is where I bought the polish too and reckon Supercheap should have the supplies too..