Mirka Microstar 6-in. Hook and Loop Sanding Disc for Dry Finishing (FM-622-800)

The Mirka FM-622-800 Microstar Film Back Grip Disc is a 6 inch abrasive sanding disc for fine surface preparation and finish correction. This is a sanding disc designed for dry sanding, especially mattening and paint rectification on top-coat and clear-coat surfaces. Model Number: FM-622-800. It is a strong fit for automotive refinishing pros, body shops, marine finish work, composite fabrication, and wood processing where the goal is a controlled scratch pattern that can be polished out cleanly.

Where this disc matters is finish quality. Microstar is built to refine surfaces, not just chew through them. Mirka pairs an aluminum oxide abrasive with a semi-open coating and a special stearate layer, which helps the disc resist clogging better than more traditional abrasive products. On the job, that means more consistent cutting and less loading when you’re working coatings that can quickly plug up a disc.

The polyester film backing is a big part of why this product stands out. Film-backed abrasives tend to stay more uniform during use, which helps when you’re trying to keep sanding marks even across a panel or other finished surface. That smoother backing also supports the disc through fine finishing work where surface consistency matters more than raw stock removal.

Mirka developed the Microstar line specifically for finishing applications like paint rectification, and that shows in the way the product is described. It is meant to produce a fine scratch pattern that is easy to polish out. If you’re working clear coat correction, blending work, or prep before polishing, that’s the difference between getting to the next step faster and having to chase deeper scratches that should not have been there in the first place.

Jobsite and shop practicality are handled in a straightforward way. This disc is developed for dry sanding only, which makes it a better match for workflows built around dust-managed sanding systems and quick abrasive changes. Mirka also recommends using Microstar with a 5 mm interface pad for the best result, which is useful if you’re trying to keep contact even over curved or sensitive finished surfaces.

As far as applications go, this Mirka abrasive fits best in automotive refinishing first, but it also makes sense in wood processing, composites processing, marine work, and vehicle manufacturing where surface refinement is part of the job. If you need an abrasive disc for heavy stripping, this is not the wrong product so much as the wrong category. If you need a finish-focused 6 inch film disc that stays cleaner and leaves a more polish-friendly scratch, this is exactly the kind of consumable worth buying.

Mirka FM-622-800 Microstar Film Back Grip Disc is for the final stretch, not the rough cut

If your work lives and dies by the finish, this is the kind of abrasive that earns its spot because it stays cleaner, sands consistently, and leaves a scratch pattern you can actually work with.

• Who it’s for: Body shops, painters, marine finish crews, composite shops, and woodworkers doing serious finish prep.
• Why it stands out: Film backing, aluminum oxide grain, and the anti-clog stearate layer make it more consistent than a basic paper-backed sanding disc.
• Worth knowing: This one is built for dry finishing work. If you need aggressive material removal, look elsewhere. If you need a clean surface for polishing or final prep, this is the right lane.

• What is this disc designed to do? It is designed for mattening and paint rectification on top-coat and clear-coat applications, with a fine scratch pattern that is easier to polish out.
• Is this for wet sanding or dry sanding? Mirka states that Microstar is developed for dry sanding only.
• What abrasive material does it use? It uses aluminum oxide abrasive on a polyester film backing.
• What industries is it suited for? Mirka lists automotive refinishing, wood processing, composites processing, marine industry work, and vehicle manufacturing.