I'm installing a passenger seat in a brand new vehicle that was manufactured without the passenger seat installed ( cargo van ). The holes were already present, but no threads cut. They are painted just like the entire unibody chassis.
As part of the install, I will drill out the holes with the correct drill bit for the thread cutting. Next, cut the threads, then install the bolts.
I have read that anytime you cut a hole in the steel of the car's body, you must take measures to prevent corrosion.
What would be the appropriate measures in my case? Is there any concern about corrosion in the bolt/hole interface? By this I mean the mated threads inside the hole; seems fairly well protected from air and water in there but ...