The paint is very good in my opinion on European cars in general.
A 750 is not the cheapest car to drive, you certainly can imagine. Actually the maintenance cost is VERY HIGH, think about a 12 cylinder engine, that needs to be serviced. If you are not able to do it on your own, stay away from such an expensive car. Maintenance, fuel consumption is very high, it is/was a luxury car.
See my website below under before buying, that refers to the E32 750 but is also valid for the E38, which is a 1996 model 750.
If you would fill out your profile a bit more in detail, this would help everyone here to help you, country, state at least. Here are members from all over the world.