Just a note - if you use Renovo colourant after cleaning and before proofing, beware, that stuff is thinner than water and gets everywhere, is easy to clean off the paintwork when wet but a bitch when dry (ask me how I know!!) so mask up well. Drain channel between the roof and boot lid etc. I applied the colourant with a 2" foam brush in one hand and a lump of cotton rag in the other, and was cleaning it from hidden places for months afterwards! Also the instructions say do not fold the roof for at least 24 hours after applying the colourant or you will get light coloured crease marks. Guess who folded the roof too early and found the instructions were correct!! However, I did my 968 cab just after I bought it, re-proofed it a few times with Renovo or Fabsil aerosol spray ('cos I had a part empty can of it), then after 7 years gave it the proper Renovo soap clean and rinse and was amazed how well it came up, almost as good as just after I'd recoloured it! Helped sell the car when I PX'd it for my SLK!