A dual action (DA) polisher is the machine for removing swirl marks, refining paint and applying glazes, sealants and waxes. The right one depends on the size of the panels you polish, whether you want a cable or a battery, and how much correction the paint needs. This guide explains orbit size, backing plates, corded or cordless and the difference between DA and rotary machines, and which pads and compounds to use with them.
What is the best DA polisher in the UK?
For a first machine, choose a corded 5 inch DA polisher with a short orbit and a 125mm backing plate. For faster correction on large panels, a long-throw machine covers more paint per pass, and a cordless DA suits mobile work. Pair it with DA-ready pads and compound, such as AutoBead Downforce pads and Medium Cut Compound.
DA or rotary: which do you need?
A DA polisher lets the pad spin freely while the head moves it in a small offset orbit. Because the pad is not forced round, it is far more forgiving than a rotary on thin or sensitive paintwork, and it is the low-risk way to get much better results than polishing by hand.
A rotary polisher drives the pad straight round. It cuts hard and suits heavy correction and paint levelling, but it builds heat quickly, so edges, trim and sharp body lines need taping off and heavy cut or wool pads need low speeds. That makes a rotary a machine for experienced hands, and a DA the safer first machine.
A third type, forced rotation, orbits like a DA but uses gears to drive the pad round as well.
What does orbit size mean on a DA polisher?
The orbit, or throw, is the size of the small circle the pad makes as it oscillates, in millimetres. Short-throw machines sit around 9mm to 12mm and long-throw machines around 15mm to 21mm. A longer throw moves the pad further with each orbit, so it covers more paint per pass and corrects faster.
The trade-off is technique. Our advice for long-throw machines is to use low-profile foam pads made for them, avoid heavy downward pressure, and draw a pen line on the backing plate so you can see the pad is still turning. A shorter throw keeps the pad turning more easily on curves and edges, which makes it the simpler machine to learn on.
Which backing plate size do you need?
The backing plate holds the pad. A 5 inch (125mm) plate is the usual size for bonnets, roofs and doors. A 3 inch (75mm) plate is for tight areas such as bumpers, door pillars and spoilers. Pads are normally a little larger than the plate, so check the pad sizes the machine's maker lists. AutoBead makes its Downforce pads in 3 inch and 5 inch.
Corded or cordless?
A corded machine never runs flat and costs less than a cordless kit with batteries. A cordless machine has no cable to manage, which suits mobile work, but it needs batteries and a charger, so check whether a kit includes them or is the machine only.
Pads and compounds for your DA
Every pick below is in stock with us, and every claim comes from the maker's own listing or website. AutoBead makes a matched set: three foam pads and three compounds that step down from heavy correction to a final finish, all for DA or rotary machines.
Pads
- AutoBead Downforce Foam Pads, in Heavy Cut, Medium Cut and Fine Cut: a dual foam design that AutoBead says has immense heat resistance, keeping the foam firmer for longer. The dense backing foam gives more downward pressure and better rotation, and the rubber-like backing stops polish migrating to the hook and loop. Made in 3 inch and 5 inch, for DA and rotary machines.
Compounds, from heavy cut to finish
- AutoBead Heavy Cut Compound: for heavy defects such as random deep scratches, buffer trails and sanding marks up to 1500 grade. Its diminishing abrasives work over a longer period and break down to a finish that needs little refining, and AutoBead recommends its Medium Cut Compound or Finishing Polish to refine afterwards.
- AutoBead Medium Cut Compound: removes swirl marks, imperfections and sanding marks up to 2500 grade and leaves a high gloss, which is why AutoBead says it also works as a one-step correction polish.
- AutoBead Finishing Compound: an ultra-fine polish that AutoBead says permanently removes light swirls, holograms and 3000 grit sanding marks, without marks or trails even on softer paint, for a deep, jewelled finish.
AutoBead makes all three compounds silicone free with no fillers, so what you see after wiping off is the true finish, and lists them as suitable for all paint types.
AutoBead pads and compounds compared
Figures are the maker's own, as shown on each product page.
| Product | Stage | What it is for | Sizes |
|---|---|---|---|
| AutoBead Heavy Cut Compound | Heavy correction | Deep scratches, buffer trails, sanding marks up to 1500 grade | 1L |
| AutoBead Medium Cut Compound | Correction or one step | Swirl marks and sanding marks up to 2500 grade, high gloss | 1L |
| AutoBead Finishing Compound | Finishing | Light swirls, holograms, 3000 grit sanding marks | 500ml, 1L |
| AutoBead Downforce Heavy Cut pad | Cutting pad | Dual foam, heat resistant, DA or rotary | 3 inch, 5 inch |
| AutoBead Downforce Medium Cut pad | Polishing pad | Dual foam, heat resistant, DA or rotary | 3 inch |
| AutoBead Downforce Fine Cut pad | Finishing pad | Dual foam, heat resistant, DA or rotary | 3 inch |
What else do you need to machine polish a car?
- Pads in cutting, polishing and finishing grades, such as the AutoBead Downforce pads above, from our polishing pads.
- A compound to remove defects and a polish to refine the finish. Our guide to compound vs polish explains which you need.
- Panel wipe to clear polishing oils, so you see the true finish, from our panel wipe and IPA range.
- Clean microfibre towels for wiping off residue, from our polishing microfibres.
How do you use a DA polisher safely?
- Wash, decontaminate and dry the car first, following the correct order to detail a car.
- Fit a clean pad centred on the backing plate and prime it with a little product.
- Spread the product at a low speed, then raise the speed to work it.
- Keep the pad flat, work small sections with slow, overlapping passes and do not dwell in one spot. AutoBead advises an area no bigger than six times the size of the pad.
- Let the machine do the work. Heavy downward pressure slows the pad, especially on a long-throw machine.
- Wipe off and check each section before moving on, and clean or swap pads as they load up.
Can a beginner use a DA polisher?
Yes. A DA is the low-risk way into machine polishing. Start with a finishing polish and a soft pad on a test section, check the result, and only step up to a heavier compound or pad if the defects are still there.
Need help choosing?
Tell the TDHQ team what you drive, what state the paint is in and whether you want a cable or a battery, and we will point you to the right machine, pads and polish. You can also browse every DA polisher, cordless polisher, rotary polisher and mini polisher we stock.
Last updated 30 September 2026.
