You can create a superb finish on outdrives, but to ensure the best adhesion you need to pay close attention to initial surface preparation. It’s also worth noting that the longevity of these systems probably won’t be the same as the rest of the boat, due to the usage and RPMs they have to endure.
The key to protecting underwater metals from corrosion is correct preparation of the substrate and choosing the best priming solution for your project. But before you start the preparation, you need to establish the exact type of metal you are working with.
Propellers are manufactured from bronze, stainless steel or aluminium.
Keels are usually cast iron or steel with internal lead or exposed lead incorporated into the lower end shape or added as a bulb at the bottom.
Drive shafts, trim tabs, struts and other fittings may be manufactured out of stainless steel, bronze, or steel.
Due to the severe turbulence and adhesion problems relating to bronze material we do not recommend the use of any specific primer at this time
Hard types of antifouling are the best for propellers due to the harsh conditions and high levels of turbulence they encounter.
Other surfaces can use either hard or eroding/ablative antifoulings.
Aluminium must be coated with an antifouling specially formulated for such surfaces.
Other surfaces can generally use any type of antifouling, copper based or copper free.
It is essential that the preparation of the bronze surface is thorough. The bronze should be meticulously cleaned and abraded to bright metal before priming and applying the antifouling. Take great care when abrading any propeller type, as excessive abrading can alter the profile and cause it to go out of balance.
Ensure any waste product including cans, rags, brushes, roller sleeves masking tape and paper, gloves and overalls are disposed according to local regulations. Do not allow any waste material such as unused paint to enter any waterways.
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