3M Contour Sanding Sponge - Wet/Dry Flexible Sanding Sponge, Fine to Super Fine Grit, 4.5" x 5.5"

The 3M Contour Sanding Sponge is a flexible, softback sanding sponge built to hug curves, moldings, and contoured surfaces that flat sanding blocks and sandpaper simply cannot follow. Sized at 4.5 in x 5.5 in, it works equally well for wet or dry sanding on wood, paint, metal, plastic, and drywall, making it a go-to for boat detailing, brightwork prep, hull touch-ups, and interior refinishing. The open-cell foam construction is rinseable and reusable, so a single sponge holds up across multiple sanding sessions instead of being tossed after one use. Choose the grit that matches your stage of work, from smoothing and blending to final pre-finish polishing.

Specifications

• Brand: 3M
• Shape: Contour (flexible, softback)
• Dimensions: 4.5 in x 5.5 in x 0.1875 in
• Sanding Use: Wet or dry
• Reusable: Yes, rinse and reuse
• Suitable Surfaces: Wood, paint, metal, plastic, drywall

Sizes & Options

This sanding sponge line is available in two grits. Fine grit (grade 320 to 400) is best for general smoothing, removing minor imperfections, and prepping surfaces before paint or finish. Super fine grit is intended for final-stage finishing work, light scuffing between coats, and polishing surfaces to a smooth, ready-to-finish texture. Both share the same 4.5 in x 5.5 in contoured body, so pick based on how aggressive or how fine the sanding step needs to be.