What Sandpaper should I use?

I use 6 inch sand paper pads (preferably with no vent holes in them to minimise “pig tailing” which are little squiggly lines that can sometimes be left when sanding from the velcro loops scratching through) with a 5 inch orbital sander or flexible high speed backing plate attached to a variable speed polisher. I never wet sand, just dry sand only. Please refer to Sanding Info for a more details.