Sea Hawk "Hawk Epoxy" F2 Structural Adhesive Filler. F2 Structural Adhesive Filler is part of the Hawk Epoxy system. This state-of-the-art epoxy system is for building and repairing boats, planes, surfboards, canoes, and many other substrates. There are also a multitude of home construction and repair projects perfectly suited for Hawk Epoxy. The foundation of our epoxy system is our R1 Epoxy Resin which fulfills all of the different application needs with its eleven-part catalyst and fairing options. Bonding, fairing, coating, waterproofing and air exchange reduction have never been simpler. F2 Structural Adhesive Filler thickens to an off white color creating a general purpose thickening additive for bonding, gap filling and filleting. Mix to a workable consistency, allows for sag free and easy flow properties for vertical and overhead applications.