And only after the first layer has dried, you can apply the second.
The most common repair and painting requires such a car of a car as a bumper. DIY bumper repair depends on the material from which the bumper is made and the degree of damage. So, the repair of the metal bumper of old car models is a rather laborious process in which if you do not adhere to a certain technology, then the bumper will rust. With severely damaged metal bumers, they are not repaired, but replaced.
