Interlux Flattening Agent For One Part Finish - Quart1 Part Flattening Agent A Flattening Agent specially formulated for mixing with Interlux 1 Part Finishes (Brightside Polyurethane and Yacht Enamels) and varnishes (Schooner Gold, Compass Clear, Schooner, and Original) to produce a variety of gloss, satin or matte effects. For interior or exterior use. For interior or exterior use A specially formulated flattening agent Helps to creates a variety of gloss, satin or matte effects