I am looking for the proper prep and paint for plastic bumpers both previously painted TPO and also for a new urethane bumper lip that has never been painted. Both are on front bumper of the car.I will be finish painting in gloss black. Will the Rustoleum or Brightside paints hold up without spiderwebbing or cracking? Do I use an adhesion promoter for prep? Primer over that? I would like to use a simple to touch up finish paint without clear coat for easy maintennance for parts that will surely get stone chips. Any advice will be appreciated.