Can't paint over Boss 302 stripes?

I would like to paint my car in Forza and the closest I can come is the 2013 Boss 302. However, unlike most cars you cannot put decals over the stripes. Is there a way I am missing or is this just a bug?

Just ‘one of those things’ with ‘one of those cars’ ;[ The new Mustang not a popular car to design on, I’m afraid :[

Actually, I love painting the 2015. Beautiful car!