Devcon Aluminum Putty (F) Kits Aluminum-filled epoxy putty for dependable non-rusting repairs to aluminum castings, machinery, and equipment widely used in HVAC applications. Bonds to aluminum and many other metals. Fills porosity in aluminum castings. Can be machined drilled or tapped using conventional metalworking tools. Qualifies under Mil Spec MIL-PRF-24176C, Type II Pack of 1