That is a splendid question. I've heard that one treatment will kill all the mites on your premises by biological action from the residue. The Elector should continue to work for an extended period as the mites come out of their hiding places to feed. I've used Elector for lots of different applications and one treatment is all I've ever needed. Elector breaks down faster in direct sunlight, so your dark places will have a longer lasting residue.
Your infested coop will certainly put it to the acid test. I would vacuum thoroughly then really wet down the coop using a good strong garden sprayer getting into the crack and crevices as best you can.
In a week, examine your coop, looking in all the places you know they were hiding. If you see any, repeat the spraying. Your experience will be a very valuable testimonial if it works the first time and a cautionary if it requires a second treatment. We all will be waiting for you to report back.
Your infested coop will certainly put it to the acid test. I would vacuum thoroughly then really wet down the coop using a good strong garden sprayer getting into the crack and crevices as best you can.
In a week, examine your coop, looking in all the places you know they were hiding. If you see any, repeat the spraying. Your experience will be a very valuable testimonial if it works the first time and a cautionary if it requires a second treatment. We all will be waiting for you to report back.