DA Polisher (dual action)

A DA spins the pad two ways at once. It rotates around the centre and also orbits in a wider random pattern. When you press down, the pad stalls. That's the safety net. Heat doesn't build up in one spot, and the random motion stops swirl patterns from forming.

Best polisher for beginners. Safe on every paint type. Slower at heavy correction.

Rotary Polisher

A rotary spins in one direction at high speed. Direct power, no orbital motion, no stall. It cuts faster than anything else. The trade off is heat. Hold it in one spot for a few seconds too long and you'll burn through clearcoat.

Built for cutting heavy defects. Needs experience. Leaves holograms that a DA has to clean up.

Buy a DA if you've never polished a car before. Buy a DA if you're working on a daily driver. Buy a DA if you're prepping paint for ceramic coating. Buy a DA if you only correct one or two cars a year. That covers most people.

Buy a rotary if you've used one before, or you're prepared to practice on a junk panel first. Rotaries make sense for heavy correction work like deep scratches, oxidation, old single stage paint, and caravan or boat gelcoat that's been baking in the Australian sun for years.

Buy both if you're correcting more than 5 cars a year. Most pros own both. Rotary for the cut, DA for the finish. The two machine workflow is faster than a DA alone on heavy defects, and cleaner than rotary alone because the DA wipes out the holograms.

The machine is half the story. The pad and compound you pair it with is the other half. A DA with the right pads outperforms a rotary running the wrong combo. Get this part right.

For a DA polisher

• Heavy correction. Microfibre cutting pad or wool pad with a heavy cutting compound. Pairs like Lake Country MF cutting pads with Sonax Ultimate Cut 6+ give you real cutting power on a DA.
• Medium correction. Foam cutting pad (orange or yellow High Pro) with a medium polish. Handles 80 to 90 percent of paint correction on Australian daily drivers.
• Finishing and coating prep. Soft foam finishing pad (black or red) with a finishing polish like Labocosmetica Fiero or Sonax Perfect Finish. Removes haze, refines gloss, leaves a coating ready surface.

Shop polishing pads and compounds at Detailing Shed.

For a rotary polisher

• Heavy cutting. Wool pad with a heavy cutting compound. This is what a rotary does best. Removes deep scratches, oxidation, and sanding marks fast.
• Medium cut. Foam cutting pad with medium compound. Rare workflow. Most operators jump straight from heavy wool to a DA finish pass.
• Finishing. Don't try to finish on rotary alone. The holograms are too risky to leave on the paint. Switch to DA for finishing.

Hard German clearcoats

Newer BMW, Porsche, modern Audi. The hardest clearcoats on the road. A DA polisher with a finishing pad often gets nowhere on these. Step up to a cutting pad. A DA might need 2 or 3 passes for what a rotary handles in one. For serious correction on hard German paint, the Dynabrade Forced Rotation is closer to rotary cutting power without the burn risk.

Soft European paint

Older Mercedes, Volvo, Citroën. Cuts fast but mars easily. A DA polisher with a foam cutting pad and medium polish is the safer choice. Rotary on soft paint will almost certainly leave holograms that a DA has to clean up.

Japanese OEM paint

Toyota, Mazda, Honda, Subaru. Variable. Usually softer than German, harder than older European. Most Japanese cars polish well on a DA with a foam cutting pad and medium compound. Toyota and Mazda factory paint can be thin in spots. Common to measure 80 to 95 microns total film build on a Hilux against 110 to 130 microns on most German cars. A paint thickness gauge is worth it before aggressive correction.

Repainted panels

Always unknown. A repainted panel could be 50 microns or 200 microns. There's no way to tell without measuring. Use a Defelsko PosiTector or NexPTG before any correction. A DA polisher with a finishing pad is the safe default on repaint of unknown thickness.

DA polisher workflow

1. Wash, decontaminate (iron remover and clay), dry. Mask off trim and rubber.
2. Prime the pad with 4 or 5 small dots of compound. Spread across a 30cm x 30cm section at machine off.
3. Start at speed 3 to spread. Move to speed 4 or 5 for working.
4. Firm pressure, not heavy. About 4 to 5kg of downward force. Pad shouldn't visibly slow.
5. Move 1 to 2cm per second. Overlap passes 50%. Cross hatch pattern: two passes north south, two east west.
6. Wipe residue with a microfibre. Inspect under direct light. Repeat the panel if defects remain.

Rotary polisher workflow

1. Same prep: wash, decontaminate, dry, mask. Plus check paint thickness with a gauge.
2. Prime wool or foam pad with compound. Slightly less than a DA.
3. Start at 600 to 800 RPM to spread. Move to 1200 to 1500 RPM to work. Don't go above 1800 RPM without a specific reason.
4. Light pressure. Let the machine do the work. Pressure means friction means heat.
5. Never stop the pad on the panel. Even for a second. Constant movement.
6. Touch the panel after each section. Should be warm, never hot. Hot means stop.
7. Wipe residue. Plan a DA finish pass to clean up any holograms.

For a typical DIYer doing 4 to 6 polishing sessions a year, here's the actual 5 year cost.

A DA on its own comes out around $725 over 5 years for most home users. Adding a rotary brings the total to roughly $1,330. Worth it if you're correcting heavy paint regularly. Overspend for a daily driver. The Polishing Starter Kit at $317.95 bundles the M8S V2 with pads and compound. Best starting point if you're buying from scratch.

Walk into any serious detailing shop and you'll see both machines on the bench. Almost no pro uses a rotary alone for a final result. Rotary does the heavy work. DA cleans up after.

The two stage workflow

1. Stage 1: rotary cut. Wool or heavy foam pad with cutting compound. Around 1200 to 1500 RPM. Removes deep scratches, sanding marks, heavy oxidation. Expect holograms at this point. That's fine.
2. Stage 2: DA refine. Foam polishing pad with a finishing polish. Cross hatch over the same panels. Cleans up the rotary holograms, refines gloss, leaves a coating ready surface.
3. Stage 3 (optional): DA finish. Black finishing pad with the lightest polish. Final pass before ceramic coating prep.

The combo is faster than DA alone on heavy paint, and cleaner than rotary alone. For a 1 car a year DIY user it's overkill. For anyone correcting 5 or more cars a year, the dual machine setup pays for itself within months.

Jumping straight to rotary

The biggest mistake beginners make. First hour with a rotary on real paint should never happen. Practice on a scrap panel from the wrecker first. Burn marks on a customer's car aren't the time to learn.

Thinking the machine matters more than technique

A good operator with a $199 DA will out finish a beginner with a $1000 rotary every time. Pad and compound choice often matters more than DA vs rotary. Focus on technique first.

Skipping decontamination

Polishing dirty paint just grinds contamination into the clearcoat. Always wash, iron remove, and clay before polishing. See our paint prep guide.

Wrong pad for the paint

Cutting pad on soft paint creates hazing. Finishing pad on hard paint does nothing. Start gentler than you think. Step up if you need to.

No paint thickness gauge on older cars

Any car over 10 years old probably has a repainted panel somewhere. A gauge tells you which panels are safe to cut hard on and which need finishing only. Cheap insurance.

Gear driven forced rotation machines use a mechanical orbit that doesn't stall under pressure like a regular DA. The result is consistent cutting power across the whole panel, but with the orbital motion that prevents holograms. Cuts harder than a DA. Safer than a rotary. The Dynabrade Forced Rotation DA is the standout in this category in Australia.

Buying the machine alone means another $100 to $200 in pads and compounds before you can use it. Our polishing kits bundle the right machine with pads and Sonax compounds.

• Polishing Starter Kit. From $317.95. M8S V2 plus Maxshine High Pro pads (cut, polish, finish) plus Sonax Ultimate Cut 6+ and Perfect Finish. Complete first time setup.
• M15 PRO v2 Pad Kit. From $398.50. M15 PRO with pads included. Better for heavier correction.