It is a cliche, but 'Use a Bigger Hammer' does have applications. Do you know somebody with a compressor and some air tools? Even the new electric impact guns do awesome work. Hitting the bolt with hundreds of hammer blows per minute will very often work better than the long hard pull. Adding heat is a tricky thing. What you apply heat to expands to a certain extent. The expansion causes a change in the forces holding things jammed up, the metals move. The trick with putting heat to the bolt head itself, cool technique btw, is that the expansion pushes the threads harder into the head. It still has the effect of changing the dynamics of the 'bond', just not really in a usable direction. We're dealing with a painted surface, so putting flame to the head, while protecting the bolt as much as possible, to get the head material to expand away from the bolt... not really an option.
No power tools available? Go up a size in your wrench inventory. You can't break a 1/2" drive extension. 3/8" drive isn't really meant for the big stuff. A six point socket and an 18-24" breaker bar will twist a seized 9/16" wheel stud off at the hub. Push down on the breaker bar, don't lift, ever, left and right bolt, from the right side, LOL, lefty loosy. They will break loose with a bang, don't fall flat on your face when it does.
Edit; I re-read BBG's heat technique, missed the mention of Loctite. I'm going to have to try that one day when I'm struggling on a caliper bolt or something. Chev and Ford both love their loctite.
