Painting a metal surface by hand is obviously more expensive then spray painting as there is more work involved, also you will get brush marks, -This can only be avoided by using spray painting, therefore we always recommend to our costumers to use spray painting.
Spray painting is a painting technique where a device sprays a coating (paint, varnish, etc.) through the air onto a surface. Compressed gas, usually air, to atomize and direct the paint particles.
A primer or undercoat is a preparatory coating put on our metal materials before painting. Priming ensures better adhesion of paint to the surface, increases paint durability, and provides additional protection for the material being painted.