Marking a dropper post

I bought an e-mountainbike for my parents, they differ quite a bit in height, and want to ride the same bike. So I want to get the longest dropper post I can fit for the tallest person (dad) and simply make a marking at the ride height for mom.
I know making a mark in an aluminium seat post is just a matter of marking it with a sharp object, but this would damage the seals on a dropper.
Could I still mark it like this, polish it smooth, and cover it with nail polish? I've seen GMBN do this as a repair, and I'm hoping it could be visible for my mom to set to that height.
Thanks for the help!
I know making a mark in an aluminium seat post is just a matter of marking it with a sharp object, but this would damage the seals on a dropper.
Could I still mark it like this, polish it smooth, and cover it with nail polish? I've seen GMBN do this as a repair, and I'm hoping it could be visible for my mom to set to that height.
Thanks for the help!
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