If you ivermec for mites, make sure you repeat it in 10-14 days. It doesnt kill eggs so you will have to kill any new larva that may have hatched and yes coat the legs, tea tree oil, pam, bag balm. I personally would avoid WD-40 as it's more of a risk for eating, picking and ingesting. The other items aren't really an issue if consumed. I have booted bantams and this is how I treat mine.