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http://www.axaltacs.com/content/dam/NA/HQ/Public/Nason/Documents/TDS/NSN-TDS-491-16-Eng.pdfSANDING1 hour at 70-80°F (21-27°C) OvernightFul-Poxy 491-16TM DTM Epoxy Primer/Sealer may be recoated at any stage of cure. It can be topcoated within 24 hours air dry without sanding. If Ful-Poxy 491-16TM DTM Epoxy Primer/Sealer is baked it must be sanded with P400-P600 before top coatingI read this as it's ok as long as you sand it.I had this same question with PPG epoxy primers a long time ago when I first started doing body work and nobody could answer it.