Sweet and Spicy BBQ sauce can be stored in the refrigerator in an airtight container until ready to use. A Mason jar with a lid works great. Use a clean spoon each time before dipping it into the jar. Also, the leftover sauce will be fine in the refrigerator for 3-5 days.  I usually don't have any left when I make it for grilling. I tend to go heavy on the sauce and use all of it at one time. But, if you do have some left, it will store nicely in the refrigerator.