Check out this website for heat resistant exhaust coatings in various colours...they apply the stuff and it is reputed to stay on... www.camcoat.com ...Ian
I don't know Henk...There is a pic. of a Harley Ferguson and an A10 in their gallery. Ferguson exhausts run pretty hot...they discolour their pipes as soon as they are run and are fitted with covers to mask this when built.. I have seen an article about that particular A10 in a bike magazine which showed him riding it and the pipes still looked perfect..Ian