Hi again everyone. I have another question for everyone. My chickens apparently aren't smart enough to realize they get wet in rain and have a house to go into if they want to stay dry....sooooo, here's my question. I just put their second coating of Sevin Dust on them last night with the shake and bake method. By the way, these are 5 bantam leghorn hens. From my understanding of Sevin dust it washes away in the rain. Do I have to go back out now and redust the entire run + my 5 brainless hens? Thanks in advance as usual.