The best incentive I can think of to do really good metal finishing work is to use lead, not Bondo for the final finish. When it's necessary to use a torch and a hardwood paddle to spread the filler, you won't be using any more than necessary!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!