When Abralon or Siaair pads wear out, the reverse side makes very good polish applicators. I think the worn abrasive side may stick to the Velcro but your hand makes fine cup to grip the spongy pad.
Terry cloth face cloths and cheap micro fiber towels also make good applicators. I suppose you could cut them into circles to fit the sanding block; I never tried it. I use my hand about 99% of the time.
