Came in possession of a 15gal keg recently which i converted to a brew pot. i think its an old summit keg.
the question i have is about the coating that appears to be on the inside walls of the keg.
rather than finding a perfectly smooth SS interior wall when i cut it open, there’s a “rough” surface - similar to a fine grade sandpaper. and it appears that if i really scratch into it i can get it to come off, revealing a perfectly smooth surface below.
anyone know what it is? do you need to sand/buff it out or can you brew with it as is?
any wisdom would be appreciated it.