(trying not to hijack your subject. But yeah thats one way to do it, But rich did mine by smoothing them down by hand, He also shaped the differentally by smoothing out the crease so its more of a rounded look. Ive just smoothed down the new arch and put on a top layor of primer, Only taken me three hours now (almost). Simply used 200 (i think) Wet n dry to smooth out all the crap then used some 400 and 1200 wet n dry to smooth it all down, Then layor it with plastic primer. Next ive got another coat of plastic primer, then regular primer and its all set for the bodyshop to do the rest
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Anyway, back on topic. The bumper looks good