The trick to metal finishing is to be P-A-T-I-E-N-T! Back when the only commonly available body filler was lead, the really good tin benders considered it a matter of professional pride to use little or no filler on most body work. These days, the cost of that kind of labor would be just about prohibitive for anyone who didn't have his own printing press cranking out C-notes!
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!