Hi guys. We have a Pawhut kit coop. But we are doubling the size of it this weekend, with fence pickets used as siding. we are also adding a large run made of treated 2x4's and welded fencing. What can I brush on the 3 types of wood to weatherproof it more? I don't want to make the chickens sick. If we only use it on the outside surfaces can they go back in for the night that day? What is a good product? I have never bought any weatherproofing stuff before. No idea what to get.
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