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Depends on the amount of time between coats - mist or wet. If you only wait for the paint to flash off then no sanding is needed as the solvents will react with the first coat giving you a chemical bond. But if you wait to long and the paint dries to much then you will have to wait until it is completely dry and sand for a physical bond. Mist coats can be tricky as you are creating a barrier coat that may be to dry giving you a poor bond before wet coats are applied. If prep and paint are right no sanding is needed - just polishing.
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