To be honest bud, I just spritz with either apple juice or cider. You could thin down a BBQ Sauce using either of those and that would be a good base for a mop often referred to as a glaze.
I had a similiar problem a while back finding a good mop, this is what I resorted too.
I spray about every 30 minutes, after the first hour, with a 50/50 beer/apple juice mixture. Then I just very lightly brush with sauce before they are done. I usually don't foil, but when I do, I brush lightly with sauce and spray some of the mixture in the foil before wrapping