Sublety is the key with a black car, IMO.
Why would you want to bling up your gorgeous Boxster like that?
Some sort of PDE treatment would be better, but hey, that's just me and it's your car.
I'll do the same as my old engine builder, though.
We were at Road Atlanta and it was an hour before our main race time and raining like a cow pee'in on a flat rock. I asked him if he minded if we just packed up and went home. He said, "No, it's your call. I'll call you pussy the rest of your life, but it's up to you."