If you're talking about the Standoutbranding.com skin, thanks.
Is is public? Um, I guess it is, now -- that is, there's nothing I can do to stop you from using it.
Do I mind if you use it? No, not at all, if you want to. One thing I would ask, though: if you do want to use this skin, please conduct yourself according to the highest racing standards. In other words, don't be an idiot and go around crashing into people and doing other uncool things if you're displaying the image of a real-world business. I really don't think I needed to have to say that, but I did, anyway, just in case.
So, yes, feel free to use the skin -- just remember that you're representing a real-world company.
Thanks for your interest.