One of my mentors liked to use "Bondo Remover"- - - - -ever heard of it? Instead of sanding the stuff off and creating choking clouds of dust, just warm up the back of the panel where the plastic filler is applied with a torch flame and use a putty knife to scrape it off in big thick chunks! A good coat of primer and a little sanding can hide a multitude of sins!
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!