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Keeping this in consideration, how long do you wait between coats of chalk paint?
24 hours
Subsequently, one may also ask, does chalk paint need to be sealed?
It is not advisable. Chalk Paint® decorative paint, even when sealed with a quality sealer such as Annie Sloan Soft Wax or Annie Sloan Lacquer, will not be 100% non-porous and this can present problems with cross contamination. The surface may look clean but it may not be deep down into the finish.
If you are painting something white or off white over a dark piece, you will probably need three coats for solid coverage. But because the paint dries really quickly, you don't have a long wait in between coats. If you want your piece more distressed, you may be happy after only two coats.