What are polishing pads and how do you choose the right one?
Quick answer: Polishing pads come in foam and microfibre, graded from heavy cutting to finishing. Firmer, denser foam cuts more aggressively; softer foam gives a finer finish. Microfibre cuts hardest of all and is mainly used on a rotary for heavy correction. Match the pad grade to the compound and to how much work the paint actually needs: starting too aggressively removes more clear coat than necessary; starting too soft just means repeating the job. The safe rule is to begin with the least aggressive pad-and-compound combination that gets the result.
The pad is often the variable that changes the outcome of a polishing job more than any other piece of equipment. The same compound through a cutting pad and through a finishing pad can produce very different results on the same panel: one removing deep defects, the other barely touching the surface. People obsess over which compound to buy and which machine to run, but the pad sitting between the two is doing at least half the work. Getting that combination right is the difference between a clean correction and an expensive mistake on a finite layer of clear coat.
Foam vs microfibre: two different ways to cut
Most polishing pads are open-cell foam in varying densities. Firmer, denser foam is more aggressive: it holds compound against the paint with more consistent pressure and cuts deeper into the clear coat. Softer, more open foam flexes under load, spreads the pressure and gives a finer, haze-free finish. The density of the foam matters as much as how thick or soft it feels in the hand; two pads can feel similar and behave completely differently under a machine.
Microfibre pads work differently again. Instead of foam cells abrading the surface, thousands of fine fibres do the cutting, and they cut harder than equivalent foam grades while generating more heat as they go. They are mainly a rotary tool for heavy correction where speed matters and there is enough clear coat to work safely. For most correction jobs on a dual-action machine, foam pads across two or three grades cover everything from defect removal to final gloss. Microfibre is useful in the right hands, but it shortens the safe working window on thin or aged paint, which is exactly the paint a nervous DIYer is most likely to be tackling.
The cut ladder
Pads run on a ladder from most aggressive to least. Brand colour coding varies wildly between manufacturers, so read the pad description rather than trusting that red means cut and black means finish; it does for some ranges and the opposite for others. In practical order, the grades are:
- Cutting pads: firmest foam or microfibre, used with a cutting compound for heavy swirls, sanding marks, oxidation and deeper scratches
- Polishing pads: medium foam, used with a finishing compound or light polish to remove the haze the cutting stage leaves behind
- Finishing pads: soft foam, used with a glaze, sealant or wax to apply and buff protection
- Glazing pads: very soft, minimal cut, for spreading delicate finishing products evenly
In practice most correction jobs run two working stages: a cutting pad with compound to remove the defect, then a polishing pad with a finishing compound to clear the haze. The finishing or glazing pad with a protective product comes last, after the paint is clean and corrected. The point of the ladder is not to use every rung; it is to climb no higher than you need to.
Why pad firmness and compound aggressiveness have to match
The pad and the compound are a partnership, and the mistake we see most often is mismatching them. A heavy cutting compound on a soft finishing pad wastes the compound's cutting ability and tends to smear product around without correcting much, because the soft foam absorbs the pressure that should be driving the abrasives into the defect. A fine finishing polish on a hard cutting pad does the opposite: the pad adds cut the polish was never formulated to deliver, and you can end up putting micro-marring back into paint you were trying to refine.
The sensible approach is to think of the pair as a single dial. If you want more correction, you can step up the pad firmness or the compound aggressiveness, but change one variable at a time so you can read what each is doing. Start at the gentle end of that dial and only climb if a test section tells you the result is not there yet. A test patch on a single panel, wiped down and inspected under good light, will tell you more in five minutes than any amount of guessing from a forum thread.
DA vs rotary: why pad choice differs
On a dual-action machine, the oscillating movement constantly shifts the contact point, which limits heat build-up. A cutting pad on a DA is forgiving: it is hard to burn a panel as long as you keep the machine moving. On a rotary polisher, the pad spins in one direction continuously. The same cutting pad that is safe on a DA can generate enough heat on a rotary to burn edges or strike through thin clear coat in seconds. That is why experienced rotary users tend to move to softer, more specific pads and lean on their compound choice for the cut level, rather than reaching for the hardest foam on the shelf.
If you are new to machine polishing, start on a DA with a polishing-grade pad and a light compound. The margin for error is much wider, and you can always step the cut up if the results are not where you need them. See can you damage your car with a buffer? for a full breakdown of what can go wrong and how to avoid it.
Pad maintenance mid-job
A pad that fills with dried compound stops cutting consistently and starts scratching. Clear it regularly with a pad conditioning brush while the machine is still running; this flicks out the built-up product and restores the pad's texture without stopping the job. If the compound has dried solid, swap to a fresh pad. Rinsing a loaded pad and carrying on is not reliable, and a half-clogged pad is one of the quiet causes of fresh hazing that people then blame on the compound. How much clear coat you have left is always the limiting factor, so every wasted pass with a degraded pad is unnecessary wear on a resource you cannot replace.
What we use at New Again
We run Matrix pads across all correction work. Before anyone picks up a pad or a compound, Tom, our operations manager, takes a paint depth gauge reading across the panels we are working on, and that number sets the ceiling on how aggressive we are allowed to be. We once had a black saloon come in with swirls a customer expected to take a heavy cutting pad; the gauge showed clear coat already thinned from a previous machine polish, so the whole job dropped to a polishing pad and a finishing compound, two passes, and it came up clean without taking the panel anywhere near its limit. That reading is why we did not chase the deepest marks.
A typical job then starts with a cutting pad and compound to remove the defects, moves to a polishing pad and finishing compound to clear any haze, and finishes with a soft pad for the protective product. The grade steps can be compressed or expanded depending on what the paint reveals as we work. On a badly oxidised or heavily scratched panel we may add a wet-sand pass before the pads come out at all; see wet sanding vs dry sanding for when that applies.
The starting point for all of this is a clean, contaminant-free surface. Polishing over contamination grinds particles through the pad and into the clear coat rather than correcting it; see how to prepare a car for polishing for what that prep actually involves.