A. No. However, there are times when you should refrain from applying it to cars that have serious damage on the painted surfaces. For instance, if the paint is weathering and chalking (a phenomenon which white powder will stick to your hands when you touch the painted surface due to weathering), you should not apply the coating. Even if you had done some repairing on the painted surface, it will affect the performance of the coating, so please consult your detailer before using the product. Also, Echelon provides better performance on auto body than compared to the application on metal parts and steel without paint.