Coating Terms

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During osmosis in a cup divided into two parts by a semi-permeable membrane, liquid mass in the high solvent concentration part increases and exerts a pressure on the membrane. When this pressure is high enough and doesn’t allow any further mass transfer, the movement of solvent molecules stops. This pressure is called osmotic pressure. Paint film acts as a semi-permeable membrane and lets water migrate through itself when a water-soluble impurity exists on the substrate or in its composition. Osmotic pressure in paint films results in a paint defect called “blistering“.