Painting a urethane bumper - Suggestions?

[bighank]

I am sanding the cracking and peeling paint off of GT urethane bumper. It is from a 2007 Mustang. I want to prime it, use a base coat, and several clear coats using 2K urethane or possibly epoxy paint. I have been told that flex agent shouldn't be needed using the new material.
What should I do following sanding the bumper?
Do I need adhesion promoter like "bulldog" before or instead of primer?
Should I use a regular high pressure spray gun or the new HVLP guns? I understand that the HVLP guns cause less overspray but what about the result? Is there a different technique if I use the HVLP gun?
BIGHANK

 

[J.Cagle]

Here's what you'll want to do:
Sand bumper very good, feathering out all hard chips and peeling paint lines
clean with wax and grease remover
put on 3 coats of primer( I use 2k)
put on guide coat and blocksand with 400-600 wet
If it has no dfects then apply 3 coats of base with an hvlp
then, apply 3 coats of clear with an hvlp

I'd only use an adheasion promoter is you have large areas of your bumper sanded down to bare plastic. I hope this helps. Post up pics. Good luck, Jared

 

[jay07]

Yeah, adhesion promoter would go on before the primer if needed, never after. And you would only need that for bare bumper plastic. Primer will stick to primer or paint just fine if it's scuffed up some.

As far as flex additive, I'd ask the paint shop. When I painted my old front bumper, the Dupont paint listed the flex additive as optional, so I didn't use it.