Pianted my rear diffuser black. Its having its 2 pack clear laquer applied as I type. Be ready to put back on. Couldn't believe how easy it was to take off - 2 mins.
Had to clean it with thinners, quick flat with 800 grade, apply a thin coat of 'adhesion improver' from an aerosol, sprayed it satin black (doesn't matter if its having clearcoat on top) and took to a mates who is finishing it off.
You can in fact clearcoat it with 2 pack laquer from an aerosol from your local paint factors for the same effect.
Going to look tasty on my red GTi with Monza's... has to be a good mod for under a tenner.