Due to the fact nothing sticks to the waxy coating (like paint or added layers of epoxy) it needs to be washed off. Most epoxies blush to some degree but many of the easiest epoxies do not, in reality, two. Epoxies encompass a ‘base' as well as a ‘curing' agent. https://www.propanraya.com/id/produk/epoxy-fast-dry