The real question here is how long will it take for you to mess it up? Our cars don’t live in a bubble they are for the most part driven on the roads so they get dirty, birds poo on them etc. resulting in possible damage. The paint will have to be washed, your technique products and equipment needs to be good otherwise you will mar the surface. If you are worried about surface marring have a look at ceramic coatings which provide a better shine and protection against UV and acid damage and surface marring.