In the paint spray booths of modern automotive assembly plants, the rotary collector is mounted on the overhead paint supply unit and continuously gathers overspray and solvent vapors generated by high‑speed spray guns. As the drum rotates, it directs the captured material into a sealed chamber where the paint particles are separated from the carrier gas, allowing the clean air to be recirculated back into the booth while the recovered paint is routed to a re‑coat system. This action prevents excessive paint loss, reduces environmental emissions, and maintains a stable temperature and humidity level for consistent coating quality. The collector’s design also accommodates rapid changes in paint colour or type, so line workers can switch between body‑shop stations without halting production. In a nearby body‑shop finishing line, the same rotary collector is used to reclaim solvent from primer application, ensuring the workshop complies with local emission regulations while keeping the solvent supply available for reuse. By integrating the collector directly into the paint delivery network, manufacturers achieve higher material efficiency and smoother workflow on the assembly line.