Yeah if a couple of coats of paint won't cover it or your landlord doesn't want the look of painted concrete on his walls, then you parge it. Buy a couple of bags of surface bonding cement, add some acrylic additive, mix it well and start troweling. Use a 4" x 16" trowel. Or hire someone to do it so you don't fuck up his walls even worse.
If the problem is that old paint is bleeding through your new painted topcoat, you need to seal it first with B.I.N. Stir the BIN really well or you'll have problems. DO NOT USE ANY OTHER BRAND OF "Stain Sealing" PAINT. THEY DO NOT WORK. Tell the asshole at home depot who tries to tell you otherwise that Squirell Nutkin told him to go buttfuck himself in the mouth.
After you put the BIN on you can topcoat it with any decent paint. Use an epoxy fortified paint, otherwise if there is any dampness, latex won't dry. Try this before you start parging.
Don't be painting on peoples houses dude, WTF?
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And now I'm finished posting.
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