Aluminum-filled epoxy putty for dependable non-rusting repairs to aluminum castings, machinery and equipment widely used in HVAC applications. Repairs air conditioning system components. Listed under NSN Stock #8030-00-051-4511; #8030-00-670-8553. Bonds to aluminum and many other metals. Fills porosity in aluminum castings. Can be machined, drilled or tapped using conventional metalworking tools.