Epoxy primer is a non-sanding primer! Its exact name is epoxy sealer. This product is a sealer to use on different surfaces for protection from external elements to remove contamination!
Epoxy primer can be used on fiberglass, plastic or black iron phosphate coating. Also this primer can be used on various surface cracks and dents.
Before applying a new coat of epoxy primer, it is essential that the coat of the underlying primer is completely dry. On hot and dry days it can take about thirty minutes. But on a day with cold or humid weather, it can take two or three hours.