Now, come to find out the materials they used, though sustainable, don't hold up in the moist conditions, so the siding is falling apart.

It's effective like Kilz or pigmented shellac without the brain damage. 

Ok let's see here's a quote from the gale research libraryOriginally posted by gale:Evidence of early humans living on the coast in South Africa, harvesting food from the sea, employing complex bladelet tools and using red pigments in symbolic behavior 164,000 years ago, far earlier than previously documented, is being reported in the Oct. 18 issue of the journal Nature.

You see, white was considered to be "Sterile" and "Clean"... it also happened to be an easy enough pigment.

Talk with them about all the potential issues that may come up: rehab takes 6 months instead of 2, living in a humid moist area for several days, what if the city says they must leave NOW, and many many other potential issues. 

The kitchen has only bare walls (no appliances, cabinets, countertops), certain sections of the roof have been patched with felt paper instead of shingles (most likely the whole needs to be replaced), basement has limestone walls and is moist (I believe that water is leaking into it).

In a bathroom, if you don't prime first (separately) you'll also have issues with the paint peeling up near the ceiling when the moist air from a shower rises.Prime the new drywall separately, maybe twice (it's cheap) and paint the whole wall, cutting in at the corner next to the adjoining wall.

I wound up finding the best to be Behr Marquee (about $50 gal) Usually a 1 coat job.I had a Rep from Zinzser tell me to get it, said the pigment was ridiculously good, better than theirs.

Also there will be no drywall to get damaged or moist.

There's likely a moist corner in every building I've ever owned or sold.