3M SandBlaster Sanding Sponge: New from 3M, SandBlaster abrasive sponges last 3 times longer and sand 3 times faster than coventional sponges of similar grits. 3M's construction and manufacturing technology have created sponges which maintain their inherent, high performing sanding ability. Each sponge has been coated to resist clogging and build-up of paint and are fully washable. 3M SandBlaster sponges come in seven different varieties for all your sanding needs. Refer to the chart above for suggested grit levels for your sanding needs.