Abstract: The disposable components for a spray gun include a thin, flaccid cup liner, a sleeve that installs between the upper portion of the liner and the upper portion of the cup, and a lid. The liner, sleeve, and lid include cooperating fittings for locking these components together to assure that the assembly remains sealed. A locking pin is also provided, which is installed through the rim of the lid and the rim of the liner to prevent the inadvertent disassembly of the liner and cup from the lid. A cap is also provided to seal the opening in the top of the lid when the cup and lid assembly has been removed from the spray gun. This stores any remaining paint or other liquid in the sealed cup, liner, and lid assembly in a liquid state for later use.