for stripping i really really dislike chemical means of it unless you get the whole car dipped. and thats not practical for most of us. aircraft remover is expensive, stinks, and despite what alot of people say, i havent found it to work all that well. i hate stripping cars, but if i were to have to do it, id sand the old finishes off. use an air tool or some other instrument of destruction to help with it. they make nice 8 inch sanders that are used for this and work really well. try not to use a 6 inch DA sander for this, youll only anger yourself and use alot of paper. sandblasting wokrs as well, but you cna damage the metal and you will make a mess. after you get all of that done, id use a self etching primer over the bare metal and shoot a nice primer surfacer over it. PCL makes some inexpensive ones. id use their etching primer for sure, but money no object id go with Valspars 21N primer surfacer. VERY thick stuff and it will go a long way in helping you get that car straight. of course, this is after you get the better part of the cars body work done. and i hope you keep the car inside.