Skewray Research on Nostr: This is a horrific idea. Also, you will probably want to have a long stem with a ...

This is a horrific idea. Also, you will probably want to have a long stem with a nozzle to get the spray away from the fan thrust. Better than an aerosol can would be a CO₂ cylinder & paint tank. Airbrush parts would work for a lot of that. Software would need to use the camera to actively stabilize the drone position relative to the surface.