My jar was kept in my dresser drawer and was several years old and dry  
when I needed it. Tel said to rehydrate it with DMSO. worked
Brickey
 
 
In a message dated 3/30/2017 7:35:57 P.M. Pacific Daylight Time,  
[email protected] writes:

Tel  told me many years ago that it didn't have a shelf life and that if it 
dried  out it just needed to be  rehydrated