That's much smarter than mine boblo, with regard to re-touching, it's not really viable, the frame is more chip and scratch than paint so a complete re-spray is the only real means of protecting the frame and hopefully smatening it up a bit. Althogh I don't want to over do it and give it too much theif appeal.
Incidentally, allthough I have changed a lot of components, I do still have all the orignal stuff in various boxes in the garage.
Steve, I don't remember Marins being that colour, I remember they used a dark textured matt grey paint for the main frame with flourescent coloured handlebars and forks for a year or so after I bought mine, there are several of them on this site. They also had fatter rear stays, which yours looks like it has. I thought they started to come with front suspension after dark grey bikes, and then switched to alluminium frames, but it was a long time ago.