Now that my basement drywall is all mudded & sanded, I need to prime
it and would like some advice.

I have one of those smaller 2200psi airless sprayers (borrowed from a
friend) that has the hose to stick in the paint can. I'm going to try
that hoping it works OK for me.

I have no worries with overspray in my basement, except for the
multitude of outlets and light switches I have in my walls. Any
advice on a quick and easy way to protect them from the paint
sprayer? I obviously don't want to get paint inside my boxes if I
don't have to.

Also, what is a good, sprayable primer to use on my new drywall?
Should I use latex, water, or oil based? Should I need to thin it?
Should I expect to need more than one coat? I plan on painting with a
relatively light colored latex after priming is complete.

I'm estimating I'll need about 6 gallons of primer for the first
coat...maybe more if this sprayer puts it on heavy or not.

Thanks for any feedback.

Kevin