I have an Alumacraft Yukon (aluminum boat) with a keel shaped much like the above pic. I also looked into keelguard options and have decided not to put anything on it as of yet. From what I gathered, a quality spray on bedliner material on the keel only might be a good option, but the cost was prohibitive. I was pricing material and labor (having a quality product installed professionally). Good luck with your quest and keep us posted if you come up with a good option for a keelguard.