36-grit discs are the matching item to 36-grit belts on the drum sander. If you had to sand the middles of your floor with 36-grit on the drum, you will most definitely need 36-grit to sand the edges. In the universe of floor sanding grits, 36 counts as a medium grit. Its job is to make the wood bare. If you are struggling to use 36 to make your floor bare – it is taking multiple strokes, or the abrasive particles are quickly glazing over with finish – 36 is too fine for your conditions. But if the 36-grit sails over you wood, easily leaving bare wood behind, you are on the right grit, my friend.
36-grit is never your final grit. It is an important link in the chain of the grit sequence; it cannot be used just by itself. 36-grit still leaves a pretty mean scratch in the wood. That scratch will take two more steps (60-grit, followed by 80) before it has any hope of being removed.
Allow one disc for every 25 linear feet of wall to be edged (assuming you are edging 10” out from the wall) or one for every three stair treads or one per closet.
Bolt-on style disc with 7/8” center hole