I've heard of flour before but I can just imagine a little bit of humidity plus flower plus any moisture coming up out of the concrete over time. That that would probably make a petri dish out of your floor.No doors open as it was in the 90’s and high humidity. The guy that did this is one of Crew2’s lead people. The same guy that came out to inspect the pad originally! I sure wish he had used the paint thinner on it instead! He chose not to to save us from the fumes. He told me he sometimes uses flour but this stuff is better. I sure was glad he didn’t use flour tho or we would have had bugs galore!