Invented for graffiti art, fat caps are a specalized nozzle that goes on a can of spray paint that widen the area of spray. These were invented in the late 1960's by graffit artist "Supercool". He took them off diffrent aresonal products. Today most graffit artists just but specalized fats caps off diffrent sites and magazines.
Lee- Yo supercool how did you pull of that peice, it must of taken for ever
Supercool- Naw B i just used a fat cap