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May 24, 2021 - 11:58 AM
Great Question. The re coat time for another layer of epoxy can be as short as it takes the previous coat to achieve surface tack. When in doubt, use a cotton ball to test. If the epoxy is tacky enough to pull the hair off a cotton ball, you can re coat without additional surface prep or sanding all the way up until you can no longer indent a fingernail into the previous coat. At that point you will want to lightly scuff sand between coats to promote adhesion. Easy way to remember that is if you can sand, you should sand. Keep in mind, warmer conditions and thicker coatings set up faster. When over coating with Polyurethane, fallow the manufactures directions for over coating epoxy. If they don't have any, wait for the epoxy to fully dry, scuff sand with 220 grit, and then clean the sanding debris with a clean cotton rag and denatured alcohol.
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