Here is the best question we were asked last month
by your fellow Pros, check it out along with our answer:

PRO'S QUESTION: "According to the Loctite 2008 Sourcebook and website, the highest temperature rating for any threadlocker is 450F. Do you have anything that withstands a higher temperature?"

LOCTITE'S ANSWER: "Yes, Loctite has recently introduced two new threadlockers that will withstand temperatures up to 650F. Loctite 2422 is medium strength and Loctite 2620 is permanent strength."