I had a 66 I sold for a 686 back in the late 80s. Not because I wanted a 686 but because I had put my 66 in an after market smith and Wesson marked soft case. After about a month I noticed that it had some spots on it. It was rust. I cleaned it oiled it and put it back. I did not take it out of the safe for several months and when I did it was pitted with rust. I traded it and threw the case away. I have never had a problem with any SS gun since. Question, Has anyone ever had a problem with a foam case chemicals rusting a SS gun?