If your cleaned surface is going to be painted, you will have to prepare it for paint first. Paint is not necessarily used in the process of creating the initial coating.
The surface can be prepared with many different types of undercoating. Fillers can restore the surface to its original condition if is cracked or pitted. The primer is a type of undercoating designed to prepare the surface for paint. Primer sets the stage for the surface to properly absorb the final paint coating. Only when the surface has been primed properly, should the actual painting commence.
Keeping the outside of your building well maintained is important, no matter what type of facility you own. If the appearance starts to wear, that is the first sign that neglect is happening. Allowing the exterior of your commercial structure to deteriorate will cause your property investment value to drop a significant amount.
There is a very good reason as to why the painting or other coating should be properly maintained. Disintegration of the physical structure will occur with a significantly long period of neglect.