AND FOR WHAT IT'S WORTH, I CONCOUR COMPLETELY!!! I HAVE USED BONDO IN THE PAST, BUT DON'T LIKE IT. dammit-caps lock! learn to work lead, and body solder. you will not regret it! with practice you can work lead/solder into a tough surface that will stand the test of time.
this from a guy who has "frenched" headlights and tailights with nothing BUT lead. i really like working the stuff, but was taught by a master when i was young.