a multipurpose attachment for cylindrical cans containing paints , varnishes and the like , which snap - fit engages to the top of the open cans and having uniformly thin , structurally rigid , and singularly molded construction that is disposable . the paint can liner protects the can &# 39 ; s sealing channel into which the lid of a metal can mates , and provides an array of benefits suitable for either metal or plastic paint cans . in its preferred embodiment , primarily for gallon or similarly sized containers , the liner includes a pouring spout , an optional filter for use while pouring , a ribbed sloping surface for rolling excess paint from mini rollers , a horizontal shelf for resting either mini roller or paintbrush , and a linear edge for wiping excess paint from brushes .