Almost looks like that stoneware spraypaint. Looks amazing though. Love both modes. Would look cool on G1/Classics Prime. May try it out on ROTFMAO Devastator.
He must be running out of Energon and slowly rusting to death Movieverse. These things are always so neat alot of other people do this sort of thing mostly on military boards with rusted out crashed tanks and such.
Normally I would look at that figure and think "why in the world did they waste that figure by making it look rusty?". but Honestly...I know exactly why you did it, It looks awesome! Nice job!