Here is the info from BlueCoupe:

Hi John, I did what the R170 guys were doing and I ordered tautflex water based paint from Viponds Australia www.viponds.com.au but found the stock SLK anthracite colour match was not to my liking so ended up finding a local supplier who was able to match the colour 99%. He's located near Toronto Airport, ships worldwide and is easy to deal with. Here's the website: http://www.parasolinc.com/. The Viponds tautflex product is a rubbery material like the factory original so I was able to use it to build-up the scratches and then apply the Parasol spray dye to get the correct colour. The appearance is factory but now much more durable, it doesn't have the rubbery feel but finger nails no longer leave scratches! You'll need 4-5 cans to re-finish the full console and dash.