A favorite post of mine on Boxerworks on this topic:
"Wow!!!!!!!!!! After reading your post I pulled off the exhaust nuts on my R65 and "valve lapping compounded" them. What a difference! I less than 10 minutes there was no sticking, the nuts spun smoothly all the way to compression of the exhaust pipe ring, and with permatex never-sieze they smoothly torqued up. I think I need a cigarette!!!!!!!!!!!!
Teo"
http://www.boxerworks.com/phorum/read.php?f=1&i=203704&t=203149He was replying to this post:
"This might seem hokey but its worked for me. I make up a slurry of heavy wt oil and fine valve grinding compound. I brush it on the nut and the head, then run the nut on and off for a while, until all the threads are dull looking and smooth. Clean it really well, so you don't have the grit locking everything together, and put on the anti-seize and away you go. I have never had a problem with those nuts since I had to cut one off 20yrs ago.
Cheers, Gunther"
http://www.boxerworks.com/phorum/read.php?f=1&i=203183&t=203149