Most specialists and polyurethane companies advise three coats of water-primarily based polyurethane at minimum. Some buyers might elect to use four coats, but this could lead to a lot of sanding and extended curing times. With publicity to sunlight and humidity with time, epoxy may take on a yellowish color. https://mcgepoxycoatings.com/all-you-need-to-know-about-polyurethane-screed-systems/