To me the wrap is a bonus. I will be painting my boat this year with a new graphic. This will cost me at least $3000 if I do it all myself and to paint it to a level a wrap can provide it would be $20k plus. So if we were to mutually agree on the look of the wrap, we both win.
Like Joe said, if you need sponsors to support your racing, take my advice and get out. You owe it to your family not to waste your kids college fund or your retirement. Furthermore, I would not invest my $ in a team that can't support itself.