Hi
T have to confess that the privacy glass was done when I bought the car before anyone asks me how to do it. It prevents much being seen from outside but has little effect when on the inside; the view from the rear view mirror is fine as is the over-the-shoulder life saving view when overtaking. Had it not been fitted, I would have done it in this scheme of changing the appearance, which was done to give me that new car feel for a few quid (mind, the reg was £400! But in theory at least, its mine).
The most difficult part of the tinting process was masking-off the 4 clusters; they are a difficult shape so each took a good while to do. Don't even consider trying to spray them on the car. I had them horizontal (to prevent runs) on the bench with the garage door shut.
The process was, mask the reversing light and reflector areas, then lightly sand the lights. Unmask the reflectors, clean down. Mask the units, remask the reflectors and reversing lights, clean down again to remove finger prints. It took about an hour and a half to spray. I used many light coats of tint and a couple of coats of clear laquer. Its not necessary to use the laquer but it protects the tint and i can use any cleaner/polish on them without risk of removing the tint.
It was relatively warm when I did the job, but I still left the lights for 24 hours to harden. Whilst they were off I washed (carefully so not to fill the car with water!) and polished it. I also took the boot seal off and cleaned out and made good the channel. Apart from paint, masking tape and Tesco bags, I also used some double sided tape to refix the plastic trim inside the channel, it being these that help prevent water ingress to the boot.
Please note that the tint is very feint and the colour only develops with multiple coats. You can go to jet black but I don't recmmend it. There are a couple of tutorials on tinting the rear lights. None of the processes were difficult 'cept the main masking. Its just a time thing and allowing for drying time means the car is unusable until the lights are back on.