Can flux for sweating copper go bad? I had a little job the other day and just could not get a good sweat. I know everything was cleaned and fluxed properly but the flux I used was pretty old. Does it have a shelf life?
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Flux
Don't believe what the manufactors will tell you (FLUX WILL GO BAD!) I had a job in a crawl space years ago where a whole case was bad!
You just forgot to recharge the flux capacitor.