Cerakote and DuraCoat can withstand temperatures as high has 500-600 degrees F (anything over 300d degrees the riflings are damaged). With "normal" shooting, your barrel will never get close to being that hot. If you are fortunate enough to own a transferable machine gun, or if you like to "blaze" with your semi-auto, do not put DuraCoat on your barrel, as your barrel temperature will rise to over 1,000 degrees F. In those cases, use Cerakote. Our Cerakote coating can handle temperatures up to 1,800 degrees F.