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Primer/surfacer-a high-build primer with talc and body built in-is designed to be sanded and leveled to make a flat surface for the paint to sit on. Polyester primer shrinks very little, and is usually sprayed directly over bodywork for the purpose of aggressive blocking and straightening. 2K or urethane primer/surfacer is much easier to sand, but can't be layered up like poly-primers due to the higher solvent content, and the possibility of shrink-back, which will show sand scratches through the topcoats. A few coats of 2K surfacer are the perfect foundation for your paintjob, but resist the urge to use multiple coats-it'll bite you in the long run.