Well I have been looking on this site and asking question for a few months and love this site. I have decided to do my own smoker build and I went with a 500 gallon propane tank. I know it might be bigger than I ever need but I like to have party's and would love to do a whole hog sometime so I figured I would go with the 500 Gallon. My question is on cutting the tank. I have it filled with watter and soap and it had been airing out for about 2 weeks before I put the watter in it. I was wondering how long to let it set to be safe on making my first cuts. I will have pictures of step by step when I get to start the build. If you guys could let me know about how long to let it set would be great. Thanks a lot