We went through this about 2months ago. we did not find our black orp till the next morningn because it was after dark and they had been free ranging.
first, bluekote in a dauber bottle stays on much longer than the spray. we had to spray daily.Dauber application lasted three days. you MUST keep it covered or they WILL pick. We did use subcu injectible antibiotic for 2 or 3 days and stopped it when all seemed to be doing ok and was stable.
We thought we were saving a hen, but it turned out that is was a 6 month old roo. We left him in the coop the whole time because he was one of the larger birds and he was the oldest in the bunch. He was in with 7 others.
All in all,it was amazing how badly he was injured and how well he survived. It WILL take time tho. Two months later he was processed and his tail was still missing. Feathers had just begun to completely cover his tail. it was one of the reasons we did not know he was a roo!