It also provides you with a clean surface to begin your work on. Bear in mind, however, primer only functions as a foundation. The application of only primer with no paint over it makes for a poor outcome. Therefore, primers extend the life of the finish after applied. Primer is also convenient for the worker.
Primer tends to dry quickly and evenly.
It is relatively painless to put on several coats. Multiple coats are recommended for the primer to be most effective. You will have a flat finish for an easier paint job. Specialized primers also exist to rid the sign's surface of small problems such as nicks and scratches. To begin with the basics, you should consider beginning with water-based paint.