I don't see how this would help, the only thing this does is keep the glass together, so instead of the water rushing out in 1 second it would take 20 seconds.
This is just like putting duck tape on a car window before you break it, *I am not speaking from experience
here is some FAQ from 3M
http://solutions.3m.com/wps/portal/3M/en_US/WF/3MWindowFilms/Products/FAQs/
Are 3M Scotchshield (Ultra) Films hurricane-proof? Bullet-proof? Burglar-proof? No, 3M Scotchshield Ultra Films are not hurricane-proof, earthquake-proof, bullet-proof, bomb-proof, nor burglar-proof. Again, they are designed to make the window glass more shatter-resistant.
In the event of a
windstorm, these films may have significant safety and security value. They can reduce the risk of injury from flying shards of broken glass, and possibly help prevent debris and water penetration through the window depending on the severity of the storm (and the type of glass, framing system, size and velocity of objects, and more).
In an
earthquake, these films can reduce the risk of serious injury from flying shards of broken glass, and possible prevent glass from falling out of a home or building. Again, much may depend upon the severity of the quake (and the type of glass, framing system, and more, too).
Bullets: these films are not designed to stop bullets.
3M Scotchshield Films were originally developed to address international concerns and needs for improved safety and security against
terrorist acts of bombings. These films can significantly reduce the risk of serious injury from flying shards of glass due to blasts, however, much depends upon the severity of the blast and the proximity of the window glass to the blast (and glass type, framing system, and more too).
3M Scotchshield Ultra Films are a low profile, high performance measure of security in the battle against
'smash and grab' crime. The tough, shatter-resistant qualities of the film can hold the window glass together even if a brick (or similar object) were actually to pass through the glass. The thief must now make a choice; continue to attack this window, try another window, or move on. Time is short, and often they move on. However, if they are determined to gain entry, they will get in. It is generally recommended that the property have proper alarm systems in addition to Scotchshield ultra Window Film.

Will 3M Scotchshield (Ultra) Film keep my glass from breaking?
This is difficult to answer with any degree of certainty because it is difficult to test for this. Window glass varies in strength from piece to piece, and lot to lot. So, if a 3M Scotchshield protected window were impacted, yet, failed to break, it would be difficult to determine if the glass alone, the film alone, or the film and glass together resisted the breakage.
When glass breaks, 3M Scotchshield Ultra Film demonstrates it's best performance!