If you have a decent chance of getting it, and its a nice size job - just sub the work out. I def. wouldn't do the work myself... either with that thick of film or the 995... too many liabilities if its not done properly and god forbid something happens.... Not something I want to be pulled in to. But if you know someone who is able to do that type of work, might as well make something from it. Even a referral fee or something.
I've never used anything thicker then 8 mil, and even with that, I pre-cut it on a table. I've heard anything thicker and you just can't do it on the window.... it's just too thick.
As for sealing it - depends what they are looking for. Which at that thickness, I would assume they want more then just to make the glass safe for showers and hot tubs. ie Anti-intrusion. In which case, yes, some type of attachment would be needed. I've never gotten into that aspect of it, so I can't offer any advice in that regard. Dow 995 seems to be what is used... and called for in specs.
I know that doesn't really help you much... Hopefully someone else will have some more advice for you.
