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Welcome to the forum, Robie.
Before you decide on what kind of paint, you may want to make sure you really want paint in the first place. It's sort of a 1-way trip.
With worn plaster, so long as it's not delaminating (coming off in sheets or flakes), you just have to rough up the surface in order to replaster. BUT, once you paint, pretty much every bit of that paint has to be removed before you can replaster.
So . . . if you are planning to replaster, you might want to go ahead and call the local guys that would do it. See how much it will add, if you paint first. Some plasterers habitually strip down to the gunite regardless -- that IS more reliable -- so it might not be much more. But if your local guys just peck on old plaster, but 100% strip painted plaster, it could be considerable.
In the latter case, it might be better to put up with bad plaster for a few more years.
HOWEVER, if you still want to paint, I'd recommend epoxy, from Kelley. But read through the instructions, on this site: www.kelleytech.com I've used their products, many times, always successfully. But I could line up a squad of local contractors who'd swear their product sux, and other epoxies are worse. Epoxy is not hard to apply, but it's very, very picky. The rule you want to keep in mind is, "If you don't follow the instructions exactly, it will stick to everything you don't want it to stick to, and nothing you do want it to stick to!".
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