Hot Block Heat Stop Putty 1 lb. Tub SW-HB1

Welding Aid / Heat Sink Compound Does not burn Stops heat transfer up to 3000° F Reusable (1 tub is a lifetime supply)You may also like Solderweld SWI-SW-ABFC15 Alloy Braze - Aluminum Brazing Flux Corded Rods - 0.079 x 20 in..