If color is the only variable, then the paints should dry at equal speed if they are in the dark. The lack of light removes any effect of color difference. If they are drying in a lighted environment, then the colors that absorb the most light will dry faster (again all else being held equal). This is because the absorbed light is converted into heat within the paint, which means there is more energy in the water in the wet paint, which causes it to evaporate more quickly. Darker colors will absorb more light and therefore should dry faster.
You can use ceramic car coating , but ceramic does not mean you have to be worry-free.
Precautions must be taken to preserve the color of the car; you must avoid parking your car in the sun.
You should not clean the machine with detergents or cloth alone. Use a suitable car detergent and microfiber cloth.