Abstract: A disposable liner for the paint container of a conventional spray gun having a liner body formed from a pliable sheet material sized and shaped to closely fit the interior of the paint container and an annular collar formed from a more rigid plastic material secured near the open end of the liner body. The annular collar includes a cylindrical sidewall sized to snugly fit within the neck portion of the paint receptacle. A throw-away lid is also provided for closing the disposable liner and it is adapted to snugly fit a draw tube of the paint spray gun until it is forceably removed. The stiff plastic collar mates with the lid and allows repeated opening of the paint receptacle without ripping or tearing of the liner body in order that it might be refilled with paint as needed. In an alternative embodiment, a pair of locking means are provided on either side of both the collar and the lid of the liner.