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Discs 150 grit and finer have a coating of Anti-Clogging Lubricant
Manufactured on the basis of productivity, efficiency, durability, and is extremely cost effective.
Sanding and Finishing of fillers, primers, and wood
Smoothing and cleaning walls
Sanding of panels, old paints and fillers
H&L is what people call the velcro back
The PSA discs are tabbed back, so just pull and stick