You should avoid using Kilz primer as a permanent substitute for finish paint because it is not designed to withstand daily wear and tear. Primers are chemically engineered with high-porosity formulas meant to seal surfaces and bond with subsequent coats, rather than resist scrubbing, UV fading, or household stains. Leaving Kilz unpainted will result in a chalky, easily soiled surface that degrades rapidly under normal residential living conditions.
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