Reservoir systems for hand-held spray guns and methods of use

A lid for a spray gun reservoir system comprising:

• a lid body comprising:
• a spout;
• a platform at least partially surrounding the spout, wherein the platform defines a major plane and a partial helical shape declining with respect to the major plane and revolving about a central axis of the spout;
• and
• a wall comprising an outer face adjoining the platform and comprising a portion that is declining with respect to the major plane of the platform;
• wherein the partial helical shape begins in the major plane and interrupts the declining portion of the outer face of the wall, and
• wherein the lid is configured to directly or indirectly attach to a spray gun.