This will help prevent surface rust and, more importantly, prevent moisture getting into the electronics, plug leads and suchlike.

Some cars can still develop patches of surface rust, but usually only because of external damage such as stone-chipping.

This should skim off the surface rust before it has chance to cause too much damage.

Upon noticing surface rust on the rotor, the vessel was brought ashore for cleaning and balancing, but good metal was unintentionally removed.

The ship has been sustaining surface rusting with many of the windows removed.