Not that I'm any expert, but it seems like you wouldn't make very good friends with your mechanic by doing that. If you replace the tie rods you MUST get an alignment immediately afterwards, and the first thing he is going to do is put a wrench on the tie rod. Any loctite on there would only be a nuisance to him and wouldn't do you any good after he broke it loose.
If you are talking about the tie rod inners, however, I don't know the answer to that one. I replaced the inners and outers on mine and didn't use any loctite. No problems yet (knock on something)