I've read the other messages that talk about using a mix of portland cement with the basecoat as the first layer, but am wondering if that applies for using MOP to patch on a bathroom ceiling.

I have a sad tale of a homeowner plumbing repair gone awry.  To make a long story short, I had a good amount of clean water flow from upstairs through the first floor bathroom into the basement.  All of the paint separated from the underlying plaster, but as near as I can tell, everything is still solid.  The ceiling had a layer of what appears to be muslin cloth beneath the paint which I removed.  I'll be using a stripper on the plaster to remove what paint residue is left to give myself a good work surface.

The plaster is in mostly good shape...a few cracks that I will use mesh tape to bridge.  There is one spot where there is a piece of green board along with joint compound that I will be replacing due to the water damage. From what I have read, I can put in the green board, use mesh tape, and then coat with basecoat/finishcoat? 

Thanks in advance, and this forum has been a real lifesaver!

Brian