Epoxy and Polyurethane compounds are thermoset plastics. Epoxy and Polyurethane substrates bond well to each other as long as the surfaces are clean and slightly abraded.
Will epoxy stick to oil-based polyurethane?
Yes, you can. Water-based polyurethane won't cause problems when applied over epoxy resin coatings. However, I recommend using oil-based poly as epoxy resin glazes work perfectly on oil.Nov 23, 2021
Does epoxy react with polyurethane?
Did you know that Epoxies and Polyurethanes are mix ratio sensitive? Unlike Polyester materials, adding more or less hardener will not speed up or slow the reaction but will cause degradation in the cured properties.