I KNOW THIS..I have carried and used my Walker (Uberti) and my Uberti Colt .31 Pocket and my Pietta Remington '58 New Model Army (and a Uberti Cattleman's Carbine..almost forgot to mention it) in all kind's of weather in Alaska, Canadian Yukon, Montana, Wyoming, Alabama, Louisiana swamps, and certain parts of South America. I would be using BlackMag3 (and later on Triple 7-3fff) and ALWAYS Remington #10 or Remington #11 percussion caps. Snow and ice, pouring down rain, hot and humid, didn't matter. By God me and my guns were there. Sometimes they would get wet and sometimes they wouldn't. Sometimes I would carry them for a few days before changing the caps, even after carrying in the driving rain and sometimes I wouldn't, just all depended on how busy I was and how put to it I happened to be at the time (just wipe the gun down good and oil a little and leave the charges intact) ... Kerosene; ( I don't know about the fancy so called 'lamp oil' one buy's off of the shelf) REAL Kerosene will start jelling up on your ass at 77 degrees below zero. I'vd used my guns several times when the kerosene was so thick you could cut it with a knife. My guns ALWAYS fired no matter the weather. First time and every time. (still do) Now, that's the truth..Take it or leave it I don't give a s***....