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I don't know why I'm surprised by that. Even though I never looked. Leave it to the MOCO to chrome plate the bottoms of the rider floorboards (which will never be seen), and not chrome the bottoms of the passenger boards, which are seen most of the time when not carrying a passenger. Makes perfect sense.
I have used por15 on a number of projects and this is the best stuff there is for covering rust. I used to build hotrods and I would paint it on the frames and never would see rust.
I don't remember anyone EVER walking up to my bike, looking it over, then laying down and looking under the rider foot boards and saying "wow, these are dirty..."
First, automotive undercoating is porous, will mask the problem, won't cure it. The bottom of my footboards are also rusty, just one of those things, but one could take some 80/100 grit sandpaper, give the surface some tooth, spray some SEM self-etching primer on the surface (NOT primer surface, self etching primer), and rattle can over that, at least five coats, since rattle can is so thin. Then, if one wanted, one could lay on undercoating. Were it me, I'd put on Herculiner bed liner or POR15...
I second that! I used this method to paint some chrome pieces black on my old sportbike and it worked like a charm!
Not only were mine rusty underneath, but I started seeing rust on the top under the rubber floor board. Needed the right light and angle, but I seem to have that talent.
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