8mm vs 15mm Polisher: Which One Should You Buy?

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The quick answer: 8mm vs 15mm polisher

Pick the 8mm orbit for control on curves, small areas, and first-time paint correction. Pick the 15mm orbit for covering large flat panels such as hoods, roofs, and doors. The picks below lean to the small-orbit side: two list an 8mm orbit, while the third is a waxer whose listing gives no orbit size, so no 15mm pick is featured here.

What orbit size changes

Orbit size, also called throw, is the diameter of the circle the pad travels on each rotation. A small throw moves the pad in a tight circle, which makes the tool easier to control on curves and to keep flat on an edge. A large throw moves the pad across more paint on each pass, which can speed work on a flat panel but asks for more care near edges and body lines. Pad size follows the same logic: small backing plates suit tight areas, while a larger plate suits open panels.

The gear: three polishers, ranked

Griot’s Garage G8 Orbital Polisher. The correction pick here, with an 8mm orbit, a 700-watt motor, and 6 variable speed settings. It includes 2 inch and 3 inch backing plates for focused paint correction on small areas and tight contours, and it removes scratches, swirls, and oxidation per its listing. A fan-cooled counterbalance and constant speed control keep it smooth under pressure, and the maker lists a gearset 45 percent stronger than previous models.

RYOBI 18 V ONE+ Cordless Eccentric Polisher R18P-0. The cordless 8mm pick, with orbital motion of 8 mm, a 125 mm polishing plate, and a speed range of 3000 to 7500 osc per min. It comes with 1 buffing pad, 1 polishing pad, and 1 finishing pad, and it suits paint renovation, polish and wax application, and micro scratch removal. The battery is not included, and with a 5.0Ah battery the listing gives about 60 minutes of work.

WEN 10PMC Waxer and Polisher. A corded 10-inch waxer and polisher rather than a correction machine, with a 120-volt motor rated at 0.75 amp and 3200 orbits per minute. It includes a 10-inch applicator bonnet, a 10-inch polishing bonnet, a 10-inch wool blend polishing bonnet, a washing mitt, and a storage case. It weighs 9 pounds and carries a 1 year warranty, and its orbit size is Not stated.

How to choose

Match the orbit to the panel

Small panels, curves, and edges favor the 8mm orbit, since the tighter throw stays controllable where a larger throw needs more care. Large flat panels favor the 15mm orbit, since the wider sweep covers more paint per pass. If the work mixes both, start with the 8mm pick and add a larger throw later, rather than learning on the larger orbit.

Corded or cordless

Corded power suits long sessions, since the Griot’s G8 and the WEN run on corded electric power with no battery to drain. Cordless suits quick jobs and work away from an outlet, but check what is in the box: the RYOBI is sold without a battery or charger, so a 5.0Ah battery is needed for the stated 60 minutes of work.

Match pad and plate to the job

Backing plate size affects where the tool can reach. The Griot’s G8 includes 2 inch and 3 inch plates for tight contours, while the RYOBI uses a 125 mm plate. The WEN uses 10-inch bonnets for waxing and polishing rather than paint correction, so match the bonnet or pad to the task, not just the tool.

FAQ: garage tools

Can I use an 8mm polisher for paint correction?

Yes. The Griot’s G8 lists an 8mm orbit and names scratch, swirl, and oxidation removal, while the RYOBI lists 8 mm orbital motion for paint renovation and micro scratch removal.

Does a 15mm polisher work on curved panels?

It can, but with more care than a small orbit, since the wider throw is harder to keep flat on a curve. For tight contours, the 8mm picks here are the easier choice, and the Griot’s G8 includes 2 inch and 3 inch plates.

Is the WEN 10PMC a dual-action polisher?

The listing does not call it a dual-action polisher; it calls it a waxer and polisher with 10-inch bonnets, and its orbit size is Not stated. For paint correction with a stated orbit, use one of the 8mm picks instead.

Do I need a battery for the RYOBI polisher?

Yes, if no compatible battery is already owned. The listing states the battery is not included, and it gives about 60 minutes of work with a 5.0Ah battery.

What pads come with each polisher?

The RYOBI comes with 1 buffing pad, 1 polishing pad, and 1 finishing pad. The Griot’s G8 includes 2 inch and 3 inch backing plates, and its listing names no pads. The WEN includes applicator, polishing, and wool blend bonnets plus a washing mitt.

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