Not quite sure what makes up the coating but pretty sure you can polish it off. Think there's a few member who have polished up juliets.
Been thinking of doing the same thing with my titanium pewter SQWs - What I am going to try is the Pinnacle Polish Brushed Finish and Crystal Clear polish and a dremel - probably start with the brushed finish paste as its more abrasive and and finish up with Crystal Clear - the tricky parts are going to be inside the orbitals and the nosebomb holders - might need a dremel wire brush for that ... I've heard that this stuff at high enough polishing speeds strips off the coating off the titanium x-metal finish off timebombs.
However, whatever you use you should probably test it somewhere safe (probably under the earsocks).