Grey Wallboard Compound

Some of the binders in drywall mud are food for microorganisms, like starch + yeast. A non setting dry compound should have a very long shelf life, years even. Ready mix types, though, will 'ferment' unless you keep them really cold. I f you have your own private beer fridge in the shop, that will work. Otherwise, just buy smaller batches and discard leftovers. The stuff is so cheap it isn't all that painful to toss out a fractin of pound or so. HTH

Joe

goes moldy, mildewy rather fast, some brands less fast, not at all happy iwth lightweight stuff in blue and white buckets