Mirka Polarstar 1.25-in. 7 Micron PSA Film Finessing Disc Pack for Spot Repair (SR-301-7A)

The Mirka SR-301-7A Polarstar SR PSA Film Finessing Disc is a fine finishing sanding disc for localized surface correction and refinement work. This is a PSA sanding disc designed for clear coat spot repair and fine defect removal. Model Number: SR-301-7A. If you are working on small paint imperfections, dirt nibs, or other minor surface flaws, this disc is built for that kind of controlled correction rather than broad material removal.

What matters here is the combination of a 7 micron grade, a compact 1.25 inch size, and PSA attachment. In practical use, that means you can target small defects without over-sanding the surrounding area, and the pressure sensitive adhesive backing gives you a secure hold on the right backup pad or sanding interface. For paint correction and finishing work, that smaller format can be a real advantage when you need precision more than coverage.

Mirka’s Polarstar line is known for fine surface finishing, and the film-backed construction is a big part of why. Compared with paper-backed abrasives, film discs generally hold up better in delicate finishing applications where consistency matters. That makes this Mirka finishing disc a better fit for users who care about a predictable scratch pattern and want an abrasive that stays usable through detailed touch-up work.

This disc is also suitable for wet sanding, which is worth calling out because wet work can help keep the abrasive cutting clean while reducing loading on fine finishing jobs. For automotive refinish work and other surface finishing applications, that can mean a more controlled result and less time chasing out unwanted marks before the next polishing or finishing step.

Because this is a PSA film disc, it is best matched with sanding tools, holders, or backup surfaces designed for pressure sensitive adhesive discs in the correct 1.25 inch size. It is not a general-purpose sanding disc for every sander on the shelf. It is a specialty abrasive for detail correction, where the right size, attachment style, and fine grading matter more than raw removal speed.

This product makes the most sense for automotive refinish technicians, detail-oriented paint correction users, body shop professionals, and serious finishers handling localized defect repair. If your work involves cleaning up clear coat imperfections and you want a Mirka abrasive built for finesse instead of brute force, this is the kind of specialty disc that earns its keep.

Mirka SR-301-7A Polarstar SR PSA Film Finessing Disc for Finish Work That Needs a Light Touch

This is the kind of specialty abrasive you buy when the job calls for finesse, not brute force.

• Who it’s for: Body shop techs, paint correction users, and finishers doing small-area clear coat repair or defect cleanup.
• Why it stands out: The 7 micron grade, film backing, and wet-sanding capability make it well suited to precise finishing work where a consistent result matters.
• Worth knowing: This is a PSA specialty disc in a 1.25 inch size, so make sure your holder or sanding setup is built for that format before you hit buy.

• What is this disc mainly used for? It is designed for clear coat spot repair, fine defect removal, and detail sanding where a very fine finish is needed.
• Can this Mirka sanding disc be used for wet sanding? Yes. The product data states that it is suitable for wet sanding.
• What attachment style does it use? It uses PSA, which means pressure sensitive adhesive backing.
• What size is the disc? The disc diameter is 1.25 inches.