Selective coating without turning masking into the main process
The customer needed a repeatable protective coating on a defined path inside a metal can lid. The important question was not whether paint could be sprayed, but whether it could follow the cut-out geometry reliably with controlled overspray.
The challenge
A customer from Poland needed to protect the inner cut-out in a can lid with a thin protective coating. The coating had to follow a predefined path with high repeatability, while unwanted overspray outside the target path had to be minimized.
The setup
The customer sent empty cans and their own coating material. We prepared a real test on a standard CNC platform and generated a G-code path following the circular cut-out. The motorized airbrush head allowed us to compare very small and wider nozzle openings.
The result
The test showed that the coating could be applied continuously along the defined groove without complex masking. We recorded the process and sent the video together with the physical coated samples back to Poland for final evaluation.
Why this matters
For protective coatings on local features, synchronized movement is often more useful than a manual operation with a mask. The same G-code path can be repeated, while nozzle opening, speed, distance, and coating behavior are tuned around the real part.