What exactly is primer and why is it used? Primer, according to Wikipedia, “is a preparatory coating put on materials before painting. Priming ensures better adhesion of paint to the surface. increases paint durability, and provides additional protection for the material being painted.”
There are three basic types of paint primer, and ones that are most often used:
Each type of primer has its own uses which primarily depends on the type of surface and the environment.
Source: Wikipedia and Ehow
Image: Wikimedia Commons