Hempthane" (properly spelled Hempathane by its manufacturer, Hempel), it is important to clarify that Hempathane is a polyurethane topcoat, whereas the product in your photo is an epoxy primer. In industrial coating systems, Interzinc 52 is applied first directly to the steel to prevent rust, while a product like Hempathane is applied as the final outer layer to provide color, shine, and UV protection. [1, 2, 3, 4, 5, 6, 7]