Abstract: A variable angle mastic applicator features a first panel and a second panel pivotally connected thereto to allow pivoting of the second panel relative to the first along an axis extending therealong. A delivery passage communicates at opposite ends with opposite sides of the first and second panels to allow delivery of mastic from a source side of the panels to an application side of the panels. The pivoting of the second panel relative to the first panel allows change of an angle at which the first and second panels diverge. A method of applying mastic involves changing the angle at which the first and second panels diverge to generally match a corner angle defined by two sheets of drywall and then delivering mastic through the delivery passage of the applicator with each panel having been placed against a respective one of the sheets of drywall adjacent the corner.