Hello PV1, sorry for the damage.
We got rear ended two month after getting our new white 2016 imiev (the bumper was only scuffed).
In early spring we got stone damage on the rear body frame that surrounds the door (the part of the cars body that sticks out when the door is closed, beside the fixed rear window).
We searched the web and ended up buying from Automotive touch ups. ( made in USA
)
http://www.automotivetouchup.com/touch-up-paint/mitsubishi/2015/i-miev/
They have all the imiev colours (except the purple).
The white is a bitch to do because you have 3 layers: base white , sparkle white cream top colour, and a clear coat.
We're happy with the results.
The tough part is the amount of sparkle cream to put, you apply the base white and it's like nope this won't work, but then you apply the top coat and it's like wow, that's the colour alright ... Just like magic.
We bought 2 ounce bottles for future touch-ups, but you can get it in pen or spray cans format.
Hope this helps,
Brian