My two cents & experience using flex seal on a coop floor..... I wish I hadn’t wasted my money. They claim that it can start onto anything and seals everything up tight. Well, my coop floor is made of OSB, and I applied it to the specifications on the cans. I also allowed it to cure for three times as long as they recommended before walking on it. INSTANT REGRET. It was so hard to spread(incredibly viscous), so painting took forever. Also, by day two of walking on it, it stared peeling up and flaking off in my main travel paths. Mind you, I was being very careful not to drag my feet or any materials across it just in case.
I tried touching base with the company to troubleshoot for WEEKS over various platforms... social media, email, website, you name it. I got nothing back from any direct emails, and when my bad reviews in social media comments were met with the standard, “We’re so sorry about your experience! Please message us with more details so we can help rectify your problem!” I was still met with silence. Worst customer service I’ve experienced.
Long story short, I wasted $80 on product, and this summer will be cleaning my coop and installing linoleum flooring. Since this is my only coop, I have no other option to seal the floor with anything that needs to dry/cure/air out for a set amount of time. Should have just gone with linoleum from the beginning.