I picked up some MTG for DW's horse that got his tail chewed. I'm not so sure I got the application right. First, this horse has a VERY thick tail--we're just going for max growth. I rubbed and rubbed but there were tons of places on his tail (by which I mean, the part with skin and bones) where it didn't apply. I used the entire contents of the neck of the bottle--enough? Any tips?