Can you polish a car too much?

Yes, you can polish a car too much. Every time you polish a car, you are removing some of the paintwork, and so if you do it too often, you can make the paintwork dangerously thin or even go right through.

You can even do this with hand polishing, although it's less likely these days. We have seen cars, where somebody has diligently polished their car with T-Cut every weekend, and worn through to the primer on corners and edges. However, this was many years ago and would have been on a car with solid base coat.