My parents have a neighbor whose house is literally made of plastic, aside from a few structural supports. You could spray this on his house and 10 hours later, goodbye house ( assuming it is PET plastic, I have no idea.)
At that point, not having the PET broken down into monomers is a pretty lousy silver lining.
(Seriously though, it needs fairly particular conditions to work.)
And it's not like the ability to dissolve plastic is new; there are plenty of solvents which will do this for various plastics.
I was going to say that it probably isn't PET, but a bit of Googling quickly turns up articles about people making houses out of recycled plastic. If that's what it is, it could well be PET.