Aluminium actually holds up much better to salt/saltwater as compared to steel. We have done a lot of saltwater testing to ensure all the vehicle parts are able to withstand it 
There is no need for any additional coating on the frame.
Aluminium actually holds up much better to salt/saltwater as compared to steel. We have done a lot of saltwater testing to ensure all the vehicle parts are able to withstand it 
There is no need for any additional coating on the frame.