I got a polyurethane spoiler and I'm going to sand, prime, paint, clear coat it. I've read up a little that polyurethane usually needs paint with a flex agent in it.

I bought some Duplicolor Adhesion Promoter, Duplicolor White Primer, and Duplicolor Super White II paint, and clear coat. . All spray can type. Is it safe to use these on the polyurethane if I wet sand, apply coats of the adhesion promoter, then prime, and paint?

Nothing I found really told me what out there is safe or not.

 

Ok is the piant you are putting on body color.......if so just primer and paint,if the piece is gonna be moved a lot like alip then it needs more flex in the paint.....adhesion promoter is good for settign primer but not needed for paint....need more details.

 

yes i'm painting it to match body color. it won't be moved at all following installation. thanks.

 

You should be fine. Flex agent is used for bumpers because they flex and the paint will crack without the flex agent. Since you spoiler won't be flexing you don't need to add flex agent. Not to mention you can't add flex to spray cans. Had to be done in the primer and color from a gun.

 

you should be fine,mainly parts that move a lot need flex agents.