Hi Forum - I have a 2019 136 Promaster that has the negative ground bolt underneath. This ground bolt interferes with the aftermarket hitches, which I plan to install next weekend (I was aware of this ahead of time based on this forum as well as reviews on Etrailer). I am looking for a recommendation as to the best way to rust proof the spot where I have removed the bolt. Is just a regular Rustoleum or Por 15 product sufficient? Or, is there something stronger that I should use, especially since it is underneath the vehicle where there is a lot of abuse. Thank you!