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Why do surfaces previously painted with low cost flat paints require primer before being repainted?

April 26, 2017flat painted paints primer repainted require surfaces

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Why do surfaces previously painted with low cost flat paints require primer before being repainted?

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Low cost paints tend to be more porous. Many coats of flat paint will create a suction effect. Therefore, if a porous surface is not primed before repainting, the finish coat may not be uniform is sheen or color.