My best advice:
God gave you the best kickten tool.. Your HANDS. Get a squirt bottle with your sauce/glaze (plug) we use Sweet Beaver BBQ Sauce in ours ;) get a pair of gloves on (if needed add cotton gloves under for heat) and use your fingers to lightly spread evenly :D No tools or brushes to clean, no brush marks, no puddles, I can just go on and on.
You can't beat your hands brother, but you can beat you meat.. ROFL
Sweet Beaver BBQ