When you print outdoor signage, do you have to put frog juice over the vinyl or seal it somehow?

I would be starting to do Race Cars and them guys like to take their cars to the car wash and use high pressure.

What is a competitive price for work done on a PC-600?

Also in my area there isn't many printers that have Print/Cut machines would I be better going for the market of middle man or just do it retail.

Any help would be appreciated