Use this when securing nuts/bolts/bolts that will be exposed to heat. It is heat resistant to around 400-450 degrees Fahrenheit. I called Loctite tech support (I got it from a hardware store where I live) and asked what product would work for these situations and they told me to buy this product. I have used it on the bolts that attach the header to the head of a water cooled motorcycle. The parts are detachable, but the clasp needs to be heated with a hair dryer before removing.