Rather than wait for my real gesso boards and aqueous dispersions, I threw caution to the wind and mulled some Titanium White pigment, mixed it with egg and water, and spread a coat over a hot pressed 140 lb Artistico block. The paper buckled and took nearly an hour to dry out. Further washes surprisingly caused more buckling; my expectation was that the first coat would seal the paper.
I had only a few pigments with which to work--Umber, Titanium White, Verona Green Earth, Red Ochre, and Carolina Yellow Earth, so I used them all. :-)
About three hours last night and another this evening.