I've purchased the tautflex from Viponds and the stuff is very easy to work with. They have MB SLK specific colours available and the Anthracite 221 matches our charcoal interiors. You will need to add their matting agent to knock down the sheen. This stuff is a bit pricey at approx. $50/200ml bottle shipped from Australia but a perfect match and blends in without stripping existing finish. Send Alan an e-mail at info@viponds.com.au or visit their website at Viponds Paints - The Paint Colour Specialists - Architectural, Industrial Signwriting Industries. Good luck!