Cool shot of the many different layers of paint the bus has work over the years. For most of its life as a London Transport bus, it was green trimmed with yellow. At its retirement it was the classic red. You can also see yellow letters over a blue background which is most likely advertising.
Here's Fidel starting to paint. We used a super-tough polyurethane enamel that is meant for lots of sun. Its a little harder to work with but will be much more durable than standard automotive paint.