Black foil on white car

Hello, it’s finally time, I have a car. Now I want to spice up my white car with cow stain foil. An acquaintance of mine said that was a bad idea, because white paint wouldn’t tolerate it and you would see it afterwards… that would be really bad, because I own a new car :/ and wanted to sell it again at some point. Is that true or can I stick it to it without hesitation?