Painting a partial panel (spot repair)
I'm fixing a PVC bumper on an RV. I've plastic welded and filled with a bumper repair kit. Getting ready for primer. I'm going to just tape off the area and and have a sharp transition between primer and original pain (Imron). Painting the whole bumper or to a transition line is out of the question.
My question is, what are the next steps to best blend in an enamel on to existing paint? Mostly interested in surface preparation, sanding, etc on the blend area to get the new paint to stick to the old.