A paint liner having a containment area within the paint liner for receiving and containing paint, the containment area defining a peripheral edge provided with a rim, the rim being provided with male and female components, the male and female components of the paint liner being positioned, shaped and sized with respect to one another so that the paint liner can be operated along first and second operating modes, where in the first operating mode the male component of the paint liner is insertable into a corresponding female component of another paint liner so that the paint liners can be nested into one another, and where in the second operating mode the paint liner is turned over so that the male component of the paint liner is insertable into another corresponding female component of the other paint liner in order to have the first paint liner cover the containment area of the other paint liner.