Hi Spencer
With the Plus Six I had stone damage from gravel flying up and damaging the underside of the front wings. Apparently the front wings were not undersealed but I have since had them done. MMC may now be underseal both font and rear on the Plus Four, but it would pay to check especially if you are driving on gravel roads.
Kerry


2019 First Edition Plus Six Moonstone Blue
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2017 Plus 4 Auto Ivory
2011 4/4 Grey
1939 4-4 Blue