Painting Plastic Plugs

[WoodyCT]

I'm falling in love with loaded Redfins.
I've tried painting over the factory finish but haven't had great results in terms of adhesion.

Does anyone know if the 'bone' colored plugs are painted or if they are just raw plastic? They feel raw to me.

Thinking Dupli-color's etching type automotive primer would grab raw plastic better than factory paint.

Thanks for any tips,

Jon