3M POLY MIC BELT

The waterproof backing held up perfectly even when I used them wet, and the micron-graded mineral cut cleanly without loading up. These are the most consistent finishing belts I've picked up in a while, the uniform grit really shows in the final surface.

Grit stays consistent across the whole belt, which made blending edges far more predictable than cheaper rolls I've used. Being waterproof meant I could keep the surface lubricated without the paper tearing apart.

Wet sanding was way less messy than I expected since these belts hold up fine underwater—the film backing didn't warp or tear on me. The grit stays uniform across the whole surface, so I got a consistent finish without any weird streaks.