3M Wetordry sandpaper cuts fast and smooth, and it can also be used to repair surface defects. It can be used with water or cutting oil. Ideal for sanding metal for repainting or prior to primer coat.
3M 09087, Wetordry Sanding Sheets 9087NA, 9 in x 11 in, 220 grit, 7010383682, 5 sheets per pack
$2.99
Factory Stock, 7-10 Day Leadtime, Priced Per Pack
3M Wetordry allows you to sand between coats of varnish and paint or other finishes. Can be used with water to reduce clogging and extend abrasive life. Ideal for sanding metal for repainting or prior to primer coat.

Dynabrade 95843 Dynabrade Air Lube 10W/NR, 1 Gallon
3M 08458, Rigid Pillar Foam, 200 mL Cartridge, 7100004037
Standard Abrasives 78522, Ceramic Pro Type 29 Flap Disc, 645128, 4-1/2 in x 5/8-11 60 Y-weight, 7010369544, 10 per case 
