Propeller & Stern Gear Antifouling

It is generally recommended to go for a hard antifoul for your propellers and outdrives, most brands have a specialist option to choose such as International Prop-O-Drev, Hempel Ecopower Prop Spray or Seajet's Propeller Triple Pack - something that is able to cope with the speed in which they move through the water when in use.

It's also important to note the material they are made of to ensure you get no reactions.  Always use a primer when applying to bare metal as well.