I always sand my glass, aluminum, steel, etc. calls just before I leave my truck to walk in the woods. However, the long walks I have to make usually cause the suface to "smooth out" enough that I don't get a good sound unless I sand them again once I've arived at my hunting spot. When I do that though, it makes a fairly loud sound that doesn't sound natural to me. Is there a better way to accomplish this?

use a pouch or find a lid cover for your calls , Tupperware has lids in different sizes that may fit your pot calls. This is one of the hard problems to get around, and I understand the problem you mean. Covers tend to work best...BT

..sometime,s keeping them exsposed to air,will work and a lid also...i know i burry mine in my
vest,and moisture is most time the problem..humididty..

I keep mine in zip lock sandwich bags up here in New Hampshire
lotta dew in the morning