Is honey good for excess mucus?

Not really. honey is good for lots of things. For instance, if you have a cold sore, apply honey to the area, and that should prevent the cold sore from coninuting to grow. Bactria cannot grow in honey, I know it is good for a sore throat and is soothing for your voice. Singers will often swallow warm honey mixed with water to sooth their vocals before singing.