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 87 Additive and Dow Corning 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 two percent by weight of the formulation, these additives improve the water repellency of coatings without causing cracking and blistering, according to the firm.
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