Well, the stuff is used to build school busses and ambulances and semi truck trailers, and more...so I think it has been tested enough for us to make a call about using the stuff. High-heat versions are available.
I used a short strip of the stuff to attach a rudder trim tab to an RV4 I built back in the Stone Age - that tab is still in place after 28 years.
I have used it to attach skin stiffeners and other parts (G3 avionics rack - very easy to build) - preparation of the surfaces is important. Also, I used the really thin stuff - not the stuff with a foam core. I think the trucks etc are built with a thin foam core hi-temp product. Seems to me that this product would work for a canopy, but the two surfaces would need to be virtually parallel to get the right attach strength.
In other words, you could not attach plexi to the round tube structure of the slider frame and expect that to hold the plexi. You would need to make up some sort of flat surface for the tape to work within it's parameters.
Picking the right product seems to be the Big Test - there are many versions of the product.
"Not everyone needs a Rocket. Some folks, however, shouldn't live life without one.
You know who you are."
Budd Davisson, 1997