i did mine,
i washed 3 times, used some gas twice, then immediently power washed, then used 300 grit sand paper for about 4 hours. then took another 4 hours with some 600 grit sand paper, thena bout another 2 hours spot hitting with some 1000 grit. then washed again and hit it with more 1000 grit
then put 2 cans of plastic adhesion promoter on, then put 5 real light coat of paint on each peice then finished them of with a nice coat. no runs, they look great, havent had any problems at all, i scuffed one with my foot jacking around, it just discolored the top coat a little, but i took it off, hit it with some 1000grit and re spot painted that rear plastic, total time maybe 15 minutes to redo the fender at the end of the day , put it back on the next and has been fine every since. picture on bottom right
i used krylon fusion