We bought the 2013 Geneva motor show Coupe. It was used for a lot of PR and other work before it came to us. Not surprisingly the kerb side running board was quite pitted. The roads around the factory are narrow and a little frayed at the edges.There were also couple of other places that needed love.
They completely replaced the bonnets and these have been fine.
They did some parts of the body and these have been fine.
The running boards became a source of pain for both parties sadly. They resprayed them and they bubbled again quickly (3 months) and then again shortly later. In the end the factory replaced the boards completely. Now in 2018 they are bubbling again.
I know a company near to me that specialise in painting aluminium as they restore classic cars, it is likely I will look to them.