How is polishing different from compounding?
It uses a finer abrasive and a softer touch, so it removes less clear coat and leaves a cleaner finish. Compounding is for cutting out deeper defects; polishing refines what’s left until the surface reflects cleanly.
3M’s Perfect-It finishing chart splits the refining into two stages after the compound:
| 3M stage | Stated purpose | How 3M says to work it |
|---|---|---|
| Machine polish, black foam pad | Remove compound swirl marks | Medium pressure to remove swirls, light pressure to polish |
| Ultrafine machine polish, blue foam pad | Clear the finest swirls, dark-coloured cars included | “DO NOT BUFF DRY”, leave a wet film on the surface |
Pressure is part of the technique: the same polish removes marks under medium pressure and finishes under light pressure.
What can polishing fix, and what can’t it?
It fixes marks that sit in the top of the clear coat: light swirl marks, haze and the fine marks a compound leaves. Anything through the clear coat, such as a stone chip or a scratch into the colour, needs paint, not polish.
GM’s PIT5763 shows how a technician decides. A fine polish goes on first, then the paint is inspected under high-intensity fluorescent light; only if damage remains does the job move on to wet sanding. Chrysler’s bulletin 31-001-13 sets the ceiling for polishing at 0.2 mils of clear coat.
Why polishing matters for BC drivers
Because it’s the groundwork for coatings and film. A graphene-ceramic coating or paint protection film sits on top of the paint and keeps whatever marks are under it, which is why every coating package here includes polishing, and paint going under film is corrected first when it needs it.
Polishing also works on plastic. A headlight lens with light haze can be polished and sealed, and whether a hazy lens can cost you a BC inspection is covered on cloudy headlights and BC inspections.
Where polishing appears on Brookswood Tint’s menu
In three services. The one-step paint correction, which the shop calls an enhancement polish, is one pass of fine polish over roughly a day, and it’s the standard groundwork for a coating on a newer car. Two-stage correction finishes with a polish after the compound.
Every ceramic coating package includes at least one polishing stage, after the paint thickness is read. And on headlight restoration, polish and seal is the quickest option, about an hour, for lenses with light haze and no yellowing.