I mostly use the cheap mustard and then rub right before I place them on the drum. I sometimes let them sit for about 30 minutes prior to cooking. I would not let them sit overnight with the mustard on them.
I like the ideas in this thread and might try them soon.
Thanks for the idea's.
DUCAN Affinity - gasser
Mini WSM (For the 9 yr old of course)
Extreme amounts of awesome to assist
9 yr old who loves to cook