Stihl Br-400 had a crack in the gas tank. Duct tape in this case did not work Called dealer for price on new one: $81.00 Remembered Paul Harvey's comments about J-B Weld, headed to Walmart and got some. A few hours later and $81.00 still in my pocket I'm runnin' and not leakin' gas. This is a must have for the tool box. I've never used it before but now I can think of a few times I wished I had it. Just a tip if anyone hasn't tried it.