I used the same interior dye that I used when I redid the interior of that car. It held up fairly well, but I wouldn't call it permanant. If you hit it too close with a pressure washer (like a home one, not like at a car wash where they don't have much pressure) it would remove some of it. Dye's for vinyl are just a fancy way of saying flexible paint. The reason I did white is because the black looked stupid with the white top and white interior, but I was trying to cover some damage on the front bumper that the car had when I bought it.