[rcecale]

The M-Bond Pro calls for just water

The "brown wrapper" Thinset Mortar 911 says that water is acceptable, but suggests a product called CureCryllic Premium. The stated mixing rate is "approximately 1.5 gals/50 Lb bag.

PRODUCT DESCRIPTION
CURECRYLIC® 939 Premium Admixture is an
acrylic latex emulsion that has been
specifically formulated for addition to C-Cure
dry-set mortars to provide a bond coat for all
types of tile over a variety of substrates
including exterior grade plywood (EGP).
CURECRYLIC PREMIUM 939 will provide improved
bond strengths, freeze-thaw stability and
increased flexural strength over normal
dry-set mortars.
BASIC USE
CURECRYLIC PREMIUM 939 is primarily used as a
dry-set mortar additive in lieu of water to
produce a bond coat for setting absorptive,
semi-vitreous, vitreous and impervious tiles
for service in residential and commercial use.
It is suitable for interior and exterior use in
a mortar bed as thin as 3/32" to 3/16"
(2.4 to 5 mm) after tiles have been properly
embedded. CURECRYLIC PREMIUM 939 modified
dry-sets have excellent impact resistance, are
water cleanable, non-flammable, and greatly
reduce water absorption which weakens
normal bonding material when subjected to
freezing conditions. CURECRYLIC PREMIUM 939
modified dry set mortars are not affected by
prolonged contact with water after curing but
do not form a waterproof barrier.

Randy