If so, add more filler. If not -- while the painter's tape is still in place -- carefully sand the area smooth. When you're done, remove the tape and examine the fix. If the filler is still a bit ...

We used to do it the same way we tape drywall, by applying five pounds of body filler and then sanding off 4-9/10 lbs. Then we went to “boot camp” at 3M and learned there's an easier way (as ...