Cuprinol, AntiFirescale Coating aprox 4 oz.

Cuprinol Flux and Anti Fire scale Coating    aprox 4oz 

Reliable firescale retardant and flux agent in one, Cupronil® is safe on all non-ferrous metals. Effective from 1100°–1500°F (593°–816°C); contains copper, potassium, sodium borate and boric acid.