 You have to deal with real high temperatures. If you live in an area where you're expecting high temperatures, read the label on the products you're going to use. Make sure you know what the limitations are. I know when you get that day up about 95 and that sun's beating down on concrete, I shudder when I see somebody out there trying to repair a patch of concrete or something along those lines. This is not going to work very well. So read the limitations on the product.