I would use a prc adhesive for a more permanent repair or just clean, weld, and coat. RTV doesn't hold up very well compared to other available sealants.
No big deal, any rubber or soft plastic plug after grinding hole round will work. Expanding rubber freeze plug comes to mind. Caplugs too, they commonly used those on old school cars to fill floorpan holes.
+1 on the plastic plug. There's probably a few of them in the floor already from manufacturing. Drill the hole to whatever size will make it a perfect circle, pop the plug in.
Yours is a case of if you tried to punch a hole like that you would never be able to do it
You could likely run them over another 1000 times and it would never happen again
I ran over a large hunk of truck leaf spring years ago
I couldnt find where it hit the bottom of the car but I figured it should have made a hole from the bang
Pretty sure my wife yelled WTF was that
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