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When using retarder take care to allow for drying time. Normal acrylic paint dries in a few minutes. It is 80 percent cured in a few days and is fully cured (completely dry to the last molecule) in a week. When you add a retarding medium you slow down the drying process considerably. You are looking at more time even with a hair dryer in hand to dry the painting in the same hour as you painted it, the next day is better for more coats of paint and you should wait a week or more before varnishing. remember retarder 'retards' or slows down the drying process. If you are in a hurry use water instead.