I bought a 1 lb. kit of Devcon A epoxy steel putty in Jan. 2019 to bed some rifles, and I'm currently finishing up my second one. However, I don't know that I'll be bedding any more very soon, so I'm wondering what the real shelf life of the Devcon is. The carton says "use before 12/4/2023". This seems like a pretty precise date, so I'm guessing the stuff was manufactured on 12/4/2018, which would make it a 5-year shelf life. I know manufactures are conservative on their shelf life estimation as they wouldn't want someone with a critical industrial application coming back on them if the stuff failed to perform. Thus, I'm wondering if any of y'all have first-hand, real-life experience as to the usable shelf life of Devcon for bedding rifles? At $40 for a 1 lb. kit, I don't want to prematurely throw the stuff away just based on the date on the carton.