Mirka Microstar 6-in. Film Back Grip Sanding Disc for Dry Finishing (FM-622-2000)

Mirka FM-622-2000 Microstar Film Back Grip Disc, 6″ is a fine-finish abrasive disc for surface prep and paint correction work. This is a sanding disc designed for mattening and paint rectification of top- and clear-coat applications. Model Number: FM-622-2000. It is aimed at automotive refinishing users, marine shops, composite work, and wood processing jobs where a controlled scratch pattern matters more than aggressive stock removal.

What makes the Microstar line useful is how it handles delicate finishing work. Mirka states that this abrasive produces a fine scratch pattern that is easier to polish out, which is exactly what you want when you are trying to save time between sanding and final finishing. Instead of fighting deep scratches or uneven cut, you get a more predictable surface that is better suited for follow-up polishing and correction steps.

The disc uses aluminum oxide grain on a polyester film backing. That combination matters because film-backed abrasives tend to stay more consistent than paper-backed options in precision finishing applications. For the user, that means steadier contact, cleaner feel on the sander, and less chance of the disc breaking down too quickly during detail work.

Mirka also calls out a special stearate layer and a semi-open coating. In plain terms, that setup is there to help the disc resist clogging compared to more traditional abrasives. When you are sanding coatings and finishes, loading is one of the fastest ways to slow down the job and ruin consistency. A disc that stays cleaner longer helps maintain cut quality and reduces wasted abrasives.

This is a grip disc, so it is meant for use on compatible hook-and-loop style backing pads in the 6 inch class. Mirka recommends pairing Microstar with a 5 mm interface pad for the best result. It is also specifically developed for dry sanding only, which is important if you are matching this disc to your process and dust control setup.

The Mirka FM-622-2000 Microstar Film Back Grip Disc, 6″ makes the most sense for users doing fine finishing rather than rough shaping. If you work in automotive refinishing, clear-coat correction, marine finishing, composites, or fine wood surface prep, this is the kind of sanding disc that earns its keep by cutting cleanly, loading less, and leaving a finish that is easier to refine in the next step.

Mirka FM-622-2000 Microstar Film Back Grip Disc, 6″ Is for the Finish Stage, Not the Rough Work

If your job depends on leaving a clean surface that is easy to polish out, this is the kind of abrasive that saves time where it counts.

• Who it’s for: Body shops, detail-oriented finishers, marine and composite techs, and woodworkers doing final surface prep.
• Why it stands out: Film backing, aluminum oxide grain, and the anti-clog design all point to one thing: more consistent fine finishing with less loading.
• Worth knowing: This is a dry-sanding grip disc made for finishing applications, so do not buy it expecting heavy material removal or wet-sanding use.

• What is this disc designed for? It is designed for mattening and paint rectification of top- and clear-coat applications.
• Is this disc for wet or dry sanding? Mirka states that Microstar is developed for dry sanding only.
• What abrasive material does it use? It uses aluminum oxide grain on a polyester film backing.
• What size backing setup does it match? It is a 6 inch grip disc intended for compatible 6 inch grip-style sanding pad setups.