Recently a new technique, referred to as air brazing, has been developed for use in hermetically sealing solid state electrochemical devices such as planar solid oxide fuel cells and gas separation devices. When the braze compositon is optimized, it displays excellent long-term performance in oxidizing or reducing gas conditions. However, exposure to reducing gas on one side of the brazed seal and oxidizing gas on the other initiates degradation after several hundred hours. We will discuss the apparent mechanisms by which degradation takes place and what methods are being investigated to combat this problem.