Do acrylic paints “breathe” to allow moisture to pass through? Does this level of “breathability” is reduced with a retouch or second paint coats?
Studies show that the majority of the moisture of water generated from cooking, washing, cleaning, etc., passes through the walls. If the exterior coat captures the moisture and does not allow it to pass, flaking can occur. Moisture vapor passes more easily through water base paintings than solvent base paints. The application of additional coats of paint effectively reduces moisture vapor transmission, due to the increase in the film thickness. Nevertheless, even with several coats of paint, the film of water base paints is more permeable to water vapor in comparison with films of solvent base paints of comparable thickness.
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