You do not always have to sand raw drywall before applying Zinsser primer, but lightly sanding glossy, slick, or previously painted surfaces is strongly advised to create a mechanical bond. Zinsser primers are chemically formulated with exceptional adhesive properties that grip tight to difficult substrates without extensive prep, but scuff-sanding glossy doors, cabinets, or metal elements guarantees maximum long-term durability and prevents peeling.
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