Mirka OS-570-003 OSP-3 Primer Filler Perf-Roll is a perforated abrasive roll made for automotive paint and body repair prep. This is a sanding abrasive designed for preparing repaired areas for primer. Model Number: OS-570-003. If you are trying to standardize your sanding steps and cut down on guesswork in the prep process, this roll is built for exactly that job.

In Mirka's OSP sequence, the number 3 step is used to prepare the repaired area for primer by reducing scratches and expanding the featheredge. That matters because the transition area around a repair is where poor prep usually shows up later. Instead of treating this like just another strip of abrasive, Mirka positions it as part of a defined process, so the operator knows where it belongs and what outcome it is supposed to produce.

The 2-3/4 inch by 33.5 foot perforated roll format is practical in a real shop. You can tear off usable lengths as needed, which helps manage material use better than grabbing oversized sheets for small repair zones. The roll format also makes it easier to keep one consistent abrasive on hand for repetitive prep work instead of stocking multiple similar pieces for the same stage.

Mirka also ties this product into a broader dust-free sanding setup. According to the source data, OSP abrasives are meant to be used with Mirka sanding tools, a dust extractor, and the Mirka solution cart as part of a complete sanding system. For collision repair shops and paint departments, that kind of system approach matters because it helps keep process steps consistent between technicians and from job to job.

Who is this for? Body shops, refinish techs, and anyone handling automotive primer prep who wants a more repeatable workflow. If you already run Mirka sanding equipment, the Mirka OS-570-003 OSP-3 Primer Filler Perf-Roll makes the most sense because it drops straight into that process. If you are just looking for a random general-purpose abrasive, this is more specialized than you need. If you want an abrasive built around the primer-prep stage, this is the right lane.

Mirka OS-570-003 OSP-3 Primer Filler Perf-Roll keeps the prep step from turning into guesswork

This is a process-driven abrasive for shops that care more about repeatable results than grabbing whatever roll is closest.

• Who it's for: Automotive refinish techs, collision repair shops, and anyone building a more consistent sanding process before primer.
• Why it stands out: It is tied to a specific step in Mirka's OSP workflow, so you're not just buying abrasive length, you're buying a defined job in the repair sequence.
• Worth knowing: This is specialized shop consumable territory. If you are not following a staged repair-prep process, you may not get the full benefit of what Mirka designed here.

• What is this product used for? It is used in the OSP-3 stage to prepare a repaired area for primer by reducing scratches and widening the featheredge.
• Is this a tool or an abrasive? It is an abrasive perf-roll, not a power tool.
• Can it be used in a dust-controlled setup? Yes. The source data states it is meant to be combined with Mirka sanding tools and a dust extractor as part of a complete sanding system.
• What size is the roll? The roll is 2-3/4 inches wide and 33.5 feet long.