Hello Lenyton, it has some lettering already stored in the plotter. Therefore it is very easy to write a text. You just have to make sure that you have the special film for the windows on the car. There are some with small holes, look at the windows of delivery vans or field workers, they have them. If you write something small, it should not be a problem with the normal film. The visibility while driving should not be impaired at all. Otherwise the police can fine you.
Greetings Ramona