Trading Paints Question

I just want to understand and hopefully its easy to explain.

I want to have a custom paint on my cars for the upcoming nascar season. Is it possible to have a sim stamped paint and a custom paint at the same time?

Meaning, if you do not have "hide custom numbers" selected you would see my sim tamped, but if you don't have it selected you would see my custom paint?

I just don't want to be seen on track to others as a random colored default car if I am seeing my own custom paint. Not sure if i am explaining it correctly.