WEST SYSTEM 404 HIGH-DENSITY ADHESIVE FILLER - 404 High-Density filler is a thickening additive developed for maximum physical properties in hardware bonding where high-cyclic loads are anticipated. It can also be used for filleting and gap filling where maximum strength is necessary. Color: off-white. Sold by the 15.2 oz. Can, 43 oz. Can or 30 lb. Bag.