BigJack, My revolvers don't sit long enough for the WD-40 to evaporate. I have used it on all my guns for many years with no ill effects.Just before I load it I will lube the cylinder pin, cylinder star and the barrel. Then I run a dry patch down the barrel. Also always lube either over the ball or over the wad. You don't need lube if you use a wad but I use it keep things running smooth and clean. If I'm cleaning one to put it away for a while I just use a very light coat of Hopes gun oil. If it will be on the wall or locked up for a short time the WD-40 works great.Keep in mind that I'm a nut when it comes to clean guns and none of them are ever put a way for long without checking them and a light wipe down.