Paint correction stages, decoded: what the machine is actually doing
The stage terminology is loose across the market, so pin down what is included rather than trusting the label. A single-stage polish (often sold as an enhancement) uses one finishing polish to boost gloss and remove light swirls — the bulk of light visible defects — and suits most daily drivers. A two-stage correction adds a heavier cutting compound first to tackle deeper scratches and etching, then refines the haze that cutting leaves behind. Multi-stage work, sometimes involving wet sanding for deep defects, is show-car territory. One vendor's stage two is another's stage one plus marketing, so ask what percentage of defect removal they are targeting and how they will demonstrate it.
A useful acceptance test at handover: ask to see the finished paint under the detailer's inspection lamp, not just in flattering daylight, and check the panel edges. Machine work concentrates heat and cut at edges and creases, so clean, un-burned edges are the signature of careful work. Holograms — faint buffer trails visible under direct light — mean the final refining pass was rushed.