When it comes to wet rubbing, it's very sensitive and can't last for a long time. You should preferably make enough wet rub to be used only once . The wet rub can only remain in its original shape for a few hours. If you are somehow left with a huge amount of unused wet rub that you can't afford to discard, then you should consider storing it in an airtight jar in the refrigerator. Even then, it can only last for a few days .