All I was going to say I think has been covered.
Rod covered it really well.
Its great stuff but does need to be applied correctly. Word of caution, if you decide against protecting the paintwork and glass work then make sure you wipe any drips away straight away. Because of its chemical make up it has a tendency to leave marks and are hard to get rid of if not dealt with straight away. I’ll admit, I don’t cover anything up. I probably should but I have seen marks on windows (the first time I used it) which have been near on impossible to remove manually (machine needed).