Painting Plastic- painting a plastic grill ?

[ke6dcj]

I'm getting ready to paint the grill (not the chrome surround) black from a late-model W124.

Should it be Gloss Black like the rest of the wagon, or "Satin" Black ?

If the plastic is "TPO" (what is that?), Wurth has a special adhesion primer.

I was going to use Wurth Solvent-Clean, followed by the Wurth TPO adhesion primer, and then Wurth paint, either gloss black or satin black trim paint.

Any caveats, or another method?

Thanks,
:-) neil
1988 360TE AMG
1993 500E