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Purple rectangular sanding sponge block with grit 80 imprint

3M

3M SandBlaster Sanding Sponge Block 80 Grit 20908

SKU CH-Z2S3-ZA599

A flexible, clog-resistant sanding sponge block with self-sharpening aluminum oxide mineral for wet or dry defect removal on bare wood, metal and drywall

  • TypeSanders
  • Removes defects fast with 80-grit aluminum oxide
  • Flexible foam backing conforms to contoured surfaces
  • Electrostatically coated mineral self-sharpens for longer life
  • Clog-resistant design allows wet or dry sanding
  • Washable sponge enables reuse for multiple projects

What it is

The 3M SandBlaster sanding sponge block uses 80-grit aluminum oxide mineral on a flexible foam backing for defect removal on bare wood, metal and drywall. The electrostatically coated abrasive is self-sharpening and the block is colour-coded purple for quick grit identification. It can be used wet or dry and washed for reuse. Part number 20908.

Before ordering

Check that the surface you intend to prepare is a bare substrate such as wood, metal or drywall because the block is designed for defect removal rather than fine finishing. Confirm that 80 grit matches the material-removal stage you need; finer 100 and 150 grit versions exist for leveling and smoothing. The foam backing conforms to contours, so verify the workpiece shape suits a hand-held block.

Under sustained use

The clog-resistant coating and self-sharpening mineral maintain cutting action during extended sanding sessions without loading up. Tough foam resists tearing when pressure is applied repeatedly on contoured areas. Washing the block restores abrasive exposure so performance stays consistent across multiple work periods.

Highlights

  • Removes defects fast with 80-grit aluminum oxide
  • Flexible foam backing conforms to contoured surfaces
  • Electrostatically coated mineral self-sharpens for longer life
  • Clog-resistant design allows wet or dry sanding
  • Washable sponge enables reuse for multiple projects

Specifications

TypeSanders
Brand3M

Questions about this item

Does the 3M SandBlaster 20908-80 block come with any extra sanding sheets or a holder?

The block is a single self-contained foam-backed sponge; no separate sheets, holders or adapters are included and none are required for use.

When should I choose the 80-grit block instead of the 100-grit or 150-grit versions?

The 80-grit purple block is made for defect removal on bare wood metal or drywall; pick 100-grit for levelling and 150-grit for final smoothing.

How does the 80-grit rating translate to material removal on a real surface?

The electrostatically coated self-sharpening aluminum oxide cuts aggressively to strip old finish or level high spots, and the flexible foam conforms to contours while resisting clogging.

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