Spray Paint was seen in "Cool Bikes," "Under the Hood," and "Access Denied." It is kept in an aluminum can. In Cool Bikes, Mordecai and Rigby use it to paint their Bicycles black. In Under the Hood, Muscle Man's intention was to paint Hi Five Ghost's scooter but everyone thought he vandalized the park. In actuality, the true perpetrator was Park Avenue.
It is normal spray paint that "sprays" paint fast to paint an object fast. In Cool Bikes, the color is black, and in Under the Hood and Access Denied, the color is orange.