I know a furniture refinisher who is extremely knowledgeable about finishes. He recommended these two finishes for my bow. He said the Polycoat is flexible, durable and will withstand all the elements. There is a catalyst with it...it is an epoxy urethane. He said the Conversion Varnish is tough stuff also. He refinished our kitchen cabinets with this and it is tough. You can set a glass of water on a window sill and no ring! Have you used either one of these finishes?