The Mirka ARP300-B 3" Rotary Battery Polisher is a cordless rotary polisher built for detail work, spot repair, and polishing smaller sections where a full-size machine is overkill. This is a rotary polisher designed for polishing small areas with controlled, cordless operation. Model Number: ARP300-B-NV. If you do paint correction, automotive finishing, marine touch-up, or any small-surface polishing where maneuverability matters, this tool makes a lot of sense.

What stands out right away is the combination of a compact body and a 3 inch backing pad. That smaller pad size gives you better access around contours, pillars, trim lines, and localized repair areas. Instead of wrestling a larger machine into awkward spots, you can keep the pad where you want it and work more precisely. For pros, that means cleaner results and less time correcting mistakes caused by a tool that is simply too big for the job.

The brushless motor is a practical upgrade, not just a spec-sheet talking point. Brushless tools typically run with lower maintenance and more consistent performance, which is exactly what you want in a polishing tool that may spend long stretches feathering finishes and refining surfaces. Mirka also built this cordless polisher for users who want freedom of movement without dealing with a cord dragging across paint, catching on edges, or forcing you to work around outlet placement.

Speed control matters a lot on a compact rotary polisher, and Mirka handled that the right way with variable speed on the trigger. That gives you more control when starting the pad on the work surface and while working around sensitive finishes. In real use, that helps reduce polish sling and lowers the chance of burning the surface if you need to work slowly and deliberately. On a tool meant for small-area finishing, that control is more important than brute size.

The overall design is light, nimble, and ergonomic, which is exactly what you want when polishing for accuracy rather than just covering big panels fast. A compact cordless rotary polisher has to feel balanced in the hand or it becomes tiring and twitchy. Based on the product design and Mirka's stated intent, this one is clearly built for controlled handling in close work rather than broad-panel production polishing.

This ARP300-B-NV version is the bare tool. Batteries and charger are not included. Mirka identifies a separate kit version, MUS-ARP300, that includes two 5Ah 12V Li-ion batteries and a charger. That matters if you are already on Mirka's 12V cordless platform, because the bare tool option makes the most sense for users expanding an existing setup instead of buying into the system from scratch.

Who should buy it? Professionals first. This Mirka rotary polisher is ideal for body shop work, detailers handling spot correction, finish specialists, and anyone polishing smaller surfaces where precision matters more than pad diameter. Serious DIY users can absolutely benefit from it too, but the real value shows up when you already know why a compact cordless polisher is better than a larger machine for certain jobs.

Mirka ARP300-B 3" Rotary Battery Polisher for tight, fussy polishing work

This is the kind of tool you buy when a full-size polisher is slowing you down instead of helping.

• Who it's for: Detailers, body shop techs, marine finishers, and anyone doing spot correction or polishing in small areas.
• Why it stands out: The 3 inch format, brushless motor, and trigger-based speed control are exactly what you want for precise rotary polishing without a cord in the way.
• Worth knowing: ARP300-B-NV is a bare tool, so if you do not already have Mirka 12V batteries and a charger, budget for those separately or look at the kit version.

• Is this a rotary polisher or a dual action polisher? This is a rotary polisher designed for controlled polishing on small areas.
• What size pad does it use? The Mirka ARP300-B uses a 3 inch backing pad.
• Does this version include batteries and a charger? No. ARP300-B-NV is the tool-only version without batteries or charger.
• What battery system does it use? Mirka identifies the compatible kit version with two 5Ah 12V Li-ion batteries and a charger, indicating this tool is part of Mirka's 12V Li-ion cordless system.