Formulators of waterborne and solvent-based exterior architectural coatings can now develop paints with improved water resistance using only low levels of new silicone-based materials from Dow Corning. Dow Corning~R 87 Additive and Dow Corning~R 88 Additive create a hydrophobic silicone network in the paint that repels water but is permeable to water vapor coming from the substrate. Even when used at levels as low as 2% by weight of the formulation, these additives improve the water repellency of coatings without caus-ing cracking and blistering.
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