High color contrast between the color of the car with a color sticker will result in it firmly. However, not all cars will look attractive if you use a sticker with a high color contrast. It is also related to the type and design theme.
Just like a rainbow that Rainbow has several different colors and semicircular. Then, what is the connection between a rainbow and a sticker? There is no relationship at all, just from talking alone.
In essence, to produce a display that is firmly against the car to be fitted with the sticker then select a color sticker that contrasts with the color of the car. If the result was ugly, stay off the course and replace it with other colored vinyl. If necessary, replace it with the color of the paint color you like. Just so why bother!