I've used sable hair brushes and they are indeed the finest brushes on the planet. They are also the most expensive. The last '0' size sable brush I bought cost $15 and that had to be 10 years ago. I have a friend that is a professional water color artist and he has a larger sable hair brush that cost over $200 and they go up from there. If I was going to brush paint a bike I wouldn't buy a sable hair brush but I would look at synthetic fiber brushes at a good art supply store.