Originally Posted By: SOHCman
Actually, a soft case can "breath" so to speak, where as a hard case can trap moisture and cause corrosion/rust.
Both types will wick oil, make sure you use a good preservative every few months like CLP and it will keep that pretty wingmaster from rusting. If it's an old one, treasure it. That's back when they really took time to remove machine marks and make smooth actions.
Alternatively, wiping the exterior with a light coat of T9 is a fantactic option since it dries to a waxy film and won't wick.