I have golden rods in my two safes. One safe stores rifles horizontally on racks .. and to minimize dings I use an old wool blanket and so far I have had no issues. I dont think the material you use will make any difference .. if you have moisture in the safe .. you will have corrosion. I bought three golden rods about 15 years ago (keeping one as a spare- just in case) so far haven't had to use the spare...I am a big fan of these devices!!