A holster for a spray gun is provided. The holster is configured to hold a spray gun in place when not in use. The holster has a reservoir body that defines an open-topped chamber. A fluid may be held inside the chamber, and a nozzle of the spray gun held by the holster may submerge in this fluid. The nozzle being submerged in the fluid of the holster can prevent hardening, thickening or drying of any material left over on or in the spray gun nozzle after use.