High temp loc-tite might be a good choice but the clearance has to be much less. Also, there can be an issue getting the pieces together before the adhesive sets up. I have sleeved barrels using both acra glass and loc-tite and the epoxy is much more forgiving and gives you time to work. GD
I thought about acraglas gel, but wasn't sure how it would handle expansion and contraction, as it's pretty brittle. How did yours turn out? Did you sleeve a center-fire, or rimfire?
