What should i do if new car is having color defect?

They only have to fix what is wrong with the car now, after warranty runs out you are on your own, if a problem comes up then you will have to pay to have it fixed, only option is to trade it in when it runs out or see if they offer an extended warranty, but make sure it covers the paint and any other things you are worried about, most dealerships offer extended warranties, they pay about 1/3rd of what they will charge you for it, don't be surprised if they say $2000.00 or more for it, and go over it carefully, it will have clauses in it to make using it not worthwhile.