I bought Foundation Armor siliconate water repellent to seal the 1970s concrete in our bedroom. The efflorescence was bad, and there was musty smell when we pulled up our wood floor. The product went on super easily, covered more than expected, had almost no smell and was easy to cleaned up. It was mostly dry within an hour, and completely dry within a few hours. It was so easy I wasn't sure if it had actually done anything! But the next day I tested out water, which beaded up and didn't soak in. This is my first time using the product, and I will probably use it again.