I bottomed out on a speed bump going at a crawl at an angle. I have multiple lowered cars and never bottomed out before, but this speed bump was ridiculously high and steep and I could not reverse with cars behind. I heard the loud thumb as the chassis hit the bump. I only see a small amount of the tar substance scrapped off. Is this to protection the chassis from rust? Where can I find some to reapply to the car? Anything else I should check that is not evident from a quick visual inspection?

 

If your car still drives in a straight line, not making odd exhaust noise, or leaking any fluids(motor or transmission oil), then you are fine. I was paranoid when I bottomed out on speed bumps, they're worse than dips and driveways because of the the "metal" sound it makes. Try to avoid speedbumps altogether

 

you can get rubberized undercoating spray at an auto part store. clean the area and spray a few coats and let it dry