Fiberglass Aft Quarter Fenders Boat Maintenance Just Got Easier! Aft Quarter Fenders made of wood are often found on vintage Hatteras Yachts. Some folks refer to them spray rails, but to the contrary, the function is not to prevent spray. Instead, they protect the hull from damage when docked on a floating dock. In addition, a stainless steel strip is attached over the fender to provide more protection. Of course we know that wood and water don’t mix. The caulk used to seal the wood to the hull degrades and provides an opening for water to invade the wook….