Helping a friend to paint some black plastic fender flares on a small truck want to paint them body color silver.
After doing some research, first would be Scotch Brite, 2nd Adhesion Promoter, 3rd Sealer then base.

Is this a good Adhesion Promoter? https://www.amazon.com/Kleanstrip-Promoter-15OZ-AERO-KLE-ETPO123B/dp/B005IUBMS6
What sealer?
Do I need to ask my paint dealer to add flex agent in the base? I was going to use Nason or Eastwood
I saw some people using adhesion promoter and primer sealer in one. Any good?
Thanks for any info. Trying to learn to do more paint and body.