Hawk Epoxy C5 Clear Finish Catalyst The Sea Hawk Hawk Epoxy C5 Clear Finish Catalyst can be used with Hawk Epoxy Resin for building or repairing planes, surfboards, canoes, boats, and many other substrates. Designed for construction or repairs with superior adhesion, filling, bonding, strength, and moisture barrier qualities at higher temperatures for a very slow speed at room temperatures. Pair Hawk Epoxy C5 Catalyst with corresponding letter size on R1 Resin. Example Size 1 C5 Clear Finish Cat