Your boat’s aluminum was very expensive!  Treat it with the care and respect it deserves.  Rupp Aluma guard is "Armor All" for your aluminum.  Rupp AlumaGuard® One-Step Marine Protectant is the easy and safe way to restore and preserve aluminum and other marine metals including stainless steel, brass and chrome.  It forms a protective coating on marine metal surfaces, prevents penetration of harmful substances and restores a lasting shine. Guards against pitting and corrosion caused by the harsh effects of marine use (saltwater). Requires no rubbing or polishing.  16oz Spray Bottle