Abstract: An adjustable, rectangular paint guard for masking glass window panes of varying dimensions, comprising four separate sections, each of which has two exterior, linear edges which meet to form one of the four corners of the paint guard, each section being in overlapping relationship to two of the other sections. Flexible molding extends from each linear surface, the bottom edge of the molding capable of abutting engagement with the inner margins of the pane. In the first embodiment, the sections are simultaneously adjusted to the desired positions for a square window pane and in the second embodiment, the sections are capable of individual adjustment so as to accomodate rectangular-shaped panes of different dimensions.