A couple things to keep in mind, Water Proof is a relative term in as much
as water proof doesn't mean Vapor Proof and a vapor seal can be broken or
incomplete. Vapor barriers can sometimes trap moisture and cause many of
the problems they are supposed to prevent.
Latex and Acrylic can be helpful for shedding water as well as allowing
trapped moisture to breathe through it, or allow it to escape. This helps
prevent peeling paint as the water breaths out rather than forcing the paint
off an outside wall as happens with many Alkyd or oil enamels.
Some tests have shown that acrylic additives can improve tensile strength in
some high density mortars, but reduce compressive strength.
Papercrete means different things to different people, and characteristics
change as the components vary. What works for one may be impossible for
another due to inconsistency in materials, application, humidity,
temperatures, etc.
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