In the spring, I use Collinite #850 Metal Wax followed by Collinite #845 Insulator Wax. I use it on all aluminim and stainless steel on the boat . It lasts until I pull the boat in October. I previously used Woody wax then tried Alumigard. I needed to reapply too often. I was surprised how long the Collinite lasted and how well it protected the metals.