Tony, nice write up of a process that many of us think about but never get round to doing. I guess out of choice it should be applied when the car is brand new to get best results. The only alternative to this is a front end respray say half way though how long you think you will keep the car to give it a mid life freshen up. The garage about 5 miles from me does it for the local Official Porsche Centre and there work is superb.
What happens if you get a big stone hit the film? will it go through and require an new piece fitted.
Pleased you are enjoying your car now with all your mods. You have done a fantastic job of personalising it to your taste whilst maintaining a stock look externally.
This is good for getting the bugs of the front of the car. I dilute 3 water, 1 solution.