EIFS formulations with enhance rain resistance

A shelf-stable, non-cementitious dry mix composition comprising i) one or more extenders, pigments, fillers, or their mixtures, in a total % PVC of from 60-98%, and ii) from 10-20 wt. %, based on the total weight of the composition solids, of a water redispersible polymer powder (RDP) containing particles of a multi-stage acrylic copolymer having a calcium methacrylate salt group-containing alkali-soluble resin outer stage and one or more inner stage, the particles further containing each of one or more nucleating agent having a boiling point of 150° C. to 500° C. and a water solubility of 3.5% or less, and one or more colloidal stabilizer, wherein when the multi-stage acrylic copolymer is dispersed in water the one or more inner stage comprises an acrylic (co)polymer having a glass transition temperature (Tg) of from −40 to 50° C., calculated using the Fox equation, and wherein the weight ratio of the alkali-soluble resin outer stage to the one or more inner stage(s) range from 1:19 to 2:3, wherein the colloidal stabilizer and the multi-stage acrylic copolymer are contained in the same RDP particle, the composition has less than 5 wt. % of calcium silicate containing materials which react with water and harden to produce a water insoluble material, based on the total weight of the dry mix composition and, the RDP comprises calcium cation in a mole ratio of calcium cation (Ca2+) to moles of methacrylic acid of from 0.94:1 to 1.06:1.