Just been going through my car cleaning/detailing kit and came across a bottle of Werkstat Acrylic Prime. Not sure how familiar that brand will be to many? I bought it when I had my silver A3 as it was recommended by Polished Bliss to really bring the paintwork to life. In a nutshell before I put on EBay wondered if anyone wanted it here... perfect for silver, white or light metallic colours. Give it a google if you want clarification on the product.