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Wiktionary
overspray

n. In spray painting, the spray that goes outside the area being painted (necessary to assure coverage at the edge).

Wikipedia
Overspray

Overspray refers to the application of any form of paint, varnish, stain or other non-water-soluble airborne particulate material onto an unintended location. This concept is most commonly encountered in graffiti, auto detailing, and when commercial paint jobs drift onto unintended objects.

Usage examples of "overspray".

More gold paint on the side of the bed, paint overspray on the walls and curtains, a film of dried gold dust on the furniture, and gold footprints on the carpet, leading back to Serge, reading the label on the can of gold spray paint in his hand.

When the dissolvent was oversprayed by the second pipe, the foam turned to acid.

Grace said, her gaze moving over Michelle as she leaned heavily against the bar, plunking her oversprayed head right on top of it and closing her eyes.