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Priming DrywallDrywall primer as the preferred method of sealing the surface after the finish sand processIn essence, priming drywall is a lot like painting any other wall surface.
So, after new drywall is installed and finished, a high-quality drywall primer should be applied to coat and seal said drywall. A question that I am asked from time to time about priming drywall, is something the paint manufacturers don't like to hear, and it involves the use of ordinary wall paint. It's an option, but according to the manufacturers, not a very good one. And one that I can say with certainty, isn't a good one either. The goal of drywall primer is not to 'hide' anything, but to equalize the absorption rates (seal) of the drywall and gypsum mud, and to prepare the surface for the final coats of paint. Ordinary finish paint is not made to do that, as it is made to primarily to cover and 'finish' the wall surface, not seal it. That's why, when you try to prime with average finish paint, it tends to get sucked into the drywall leaving areas of the wall looking spotty and uneven. 
I recommend using a drywall primer - or a high quality multi-purpose latex primer - for when priming drywall is your next step. Another acceptable (in my mind) primer could be flat latex ceiling paint, as this is very close to being a primer anyway, in terms of what the actual paint is made of.Sand The Wall After Priming In order to remedy that situation, you need to lightly sand the wall with a pole sander (like the one pictured), or by other sanding means if you prefer. Tip One thing you can do to further enhance the ability of your chosen paint color to really shine forth and possibly reduce an extra finish coat, is to have the paint technician tint the primer by adding colorant. Have them tint the primer to no more than 75% of the original color of your finish paint. This keeps the tinted primer from being darker than your finish color, yet still significantly allows the final finish coat to shine forth as intended. Select only 'tintable' primer only, as this is specially formulated to do so. Depending on the color of the finish paint, you might have to apply several coats to completely cover your walls. That is, of course, if you did not tint the primer beforehand. That's alright to do as you certainly have the option to do one or the other without hurting a thing in the process 
It's definitely a waste of time and money to go to the store and buy a gallon's worth of drywall primer that you may, or may not ever use again.The solution is to get yourself a can of spray-on primer. I prefer to use Kilz Original, as it covers well and isn't all that expensive (about $6 a can). This method is ideal for areas that measure anywhere from a few inches across, to a couple of feet across, and up and down. Anything bigger would probably be better served with a quart (or more) size.
This method also covers scuff marks, dark abrasions on the walls, water stains on the ceiling, etc. Great preparation for any paint job where you need to prime, seal, or stainblock something. TOP of Priming Drywall
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It is different, however, in that with finish painting you're actually sealing the new drywall to get it ready to accept the finish coats. The paint will then go on more easily and smoothly, and result in a beautifully finished painting job .
Roughness can also be the result of dried dust particles left over from coating the drywall directly after the final finish sanding process. 
Just shake well, point, and spray. That's about it.
