A friend stored his Unique targetpistol in a case with foam.
During a hot day this foam made the gun totally RED with rust.
I was told that the foam is consisting of some kind of acid and that this was released during the heat.
However his gun looks really terrible.
Years ago i had my Walther .22 targetrifle in a homemade case with foam in and then i got almost the same result.
So I will only use those foamed cases for transport and never when its hot.
Regards HÃ?Â¥kan
http://www.vapensmedjan.com