 to waterproof and seal concrete. We talk about it twice a year because I don't know, this isn't, I don't think this is science anywhere, David, but I feel like in the fall and in the spring is a good time. Concrete's a little cooler. It can, it kind of, it doesn't just evaporate as it hits hot concrete. And so it works a little bit better, but it's an investment worth making. And I got to take