I just finished using a spray bottle of Sta-Flo that I mixed up last winter. It wasn't moldy and it hadn't even gummed up the spray bottle! No, it was not in the refrigerator and we had an unusually hot summer here.
Originally Posted by Prism99
Have you checked grocery stores? I wouldn't expect to find it at JoAnn's or in pharmacies.
The homemade stuff is fine, but only lasts about a week in the frig before it starts getting moldy. Even Sta-Flo, once it is mixed with water, gets moldy eventually. It's really inexpensive, so you just mix up a fresh batch as needed.