When I got my Spyder, I had found out the previous owner who was the only other owner of the car had Ziebart undercoating and rust protection done to it annually since the car came from the dealer lot. I pulled the rear tire well, carpet and back seats and could not find any rust on the other side. I had the undercoating touched up last year with the rust protection as well. My car is 99% of the time parked in the garage. The car is only driven during the Summer and only on days I know it will be dry unless a rain storm pops up out of nowhere. My question is would it be better to just keep touching up the Ziebart and their rust protection since it will flake with impact or would it be better use something like Fluid film or Krown annually over the remaining undercoating?

Why keep adding undercoating
If it’s never going to see winter then I’d just leave it be
Less crud to work with when you need to!

But if you feel you must.... krown would be the way to go but I don’t see why you’d have to do every year
I’m sure skipping a year or two would be okay since their product adheres quite well

K_81_K said:

their product adheres quite wel

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KenshinHimura said:

undercoating?

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Applying a quality undercoating that adheres well is good, but if you apply it on top of some that doesn't adhere well, then it's no good. A solution is only as good as what's under it, so remove all the other coating before applying something else.