Pitmaster's coating (3)
I believe the answer is:
rub
(Other definitions for rub that I've seen before include "Ointment; chief difficulty" , "Polish - difficulty" , "Work in" , "Massage or burnish" , "Irritate-...the wrong way" .)
I believe the answer is:
rub
(Other definitions for rub that I've seen before include "Ointment; chief difficulty" , "Polish - difficulty" , "Work in" , "Massage or burnish" , "Irritate-...the wrong way" .)