Aircraft Stripper, Tal-Strip and most others need to be applied pretty generously and left to sit and do work. I've had really good luck with both, even removed powdercoat on some pieces I had coated and didnt like the color. Generally I use these products only if I'm doing smaller pieces that may have been overlooked (side marker lighs, rear valence support brackets, . . . )

My opinion is if you have larger panels, and several of them, nothing beats blasting. Just be sure to use a good reputable blaster to avoid panel damage.