Festoolfootstool said:
if the sponge is kept in a ziplock type bag and the air excluded the sponge will be good for six months plus
Maybe they changed something from the time i was using it, because i kept mine in a sealed plastic bag with as few air as possible, and that would keep the sponge for a week or two max. I didn't use the metal container because the dimples would seal the bottom of the sponge and render it impermeable. Keeping it as intended in the metal containers would keep the sponge just for 24 hours, but even then it would get hard. I almost exclusively used the heavy duty oil, which i suppose hardens more.