Yea, I went to the shop and they said that they are not responsible if the defroster does rip off. With that being said, you basically going on a no guarantee basis. I think I would be more careful than an employee who is not liable for damaging the defroster. Although I do have another option, I want to make my tints 20% b/c 35% really doesnt do much.
There's really nothing wrong with the rear tint as far a bubbles and peeling is concerned, would it be a better choice to have them just retint over the existing tint??