When using Epifanes over Epoxy resins, make sure you wait two weeks or more for the epoxy to fully cure before coating with the Epifanes. I only waited about three days and the Epifanes would not dry. I sanded the epoxy before coating and "assumed" the epoxy had cured enough. WRONG!!!! I wound up removing the sticky mess with lacquer thinner. Fortunately the pieces I coated were only small sole boards for the Super Spartan. Epifanes does warn of this possibility in their website. Coating over epoxy and fiber glass is fine as long as you wait for a full cure. Test a small area if unsure or use a test piece epoxied the same time as your project.