A friend recommended the following technique for painting my dash frame, glove box door, etc. I think it would work just as well for a spoiler. Prep and spray a light coat of SEM black primer. Follow with a super light dusting with Rustoleum textured black. The dusting is really just a fog of spray shot from a distance of about 18-24” from the surface. Follow with a few good coats of SEM Trim Black. You get a real light texture as long as you go light with the Rustoleum part. The SEM paints give really good results IMO.

My pics make it look more textured than it looks to the naked eye.

I’ve never tried SEM ultra black. I think it’s supposed to be flatter than Trim Black right?