A spray gun (1) has a fluid reservoir (11) which contains a removable liner (13). The liner (13), which may be thermo/vacuum-formed from a plastic material, is a close fit within the interior of the reservoir and collapses as fluid is withdrawn from within the liner during operation of the gun. Preferably,...http://www.google.com/patents/US7798425?utm_source=gb-gplus-sharePatent US7798425 - Apparatus for spraying liquids, and disposable containers and liners suitable for use therewith
