Gave up on the 3M black sticky seal and have used Henry 430.
I tried to seal my front windows with that 3M ribbon black sticky stuff.
It failed after one year.
The windows are tempered glass and lay at an angle in a rabbited epoxied wood channel.
The window sits flat and smoothly and has sufficient edge all round.
the mode of failure was the black goo ribbon pulled free on the top edge, remaining stuck to the glass but disconnected from the epoxy frame. epoxy surface remained intact.
If you will notice, this caulk is very very sticky and yet quite stiff.
If you want to pull it free from some surface, simply yank it off and since it sticks better to itself, it will pull clean as you keep working it, yank and pull etc...
I think over time the wooden frames move at different rates than the glass and so it pulled free. A layer of dust had slowly stuck onto the goo preventing you from simply pushing the window harder back down to reseal. Being so stiff it wont move anyway.
The HENRY 430 I have had on about 3 months and is working. The gum that forms when this dries is softer and more forgiving of movement plus its tan not black.
I did 3 forward salon
windows with the black 3M. One failed miserably, the center window has a small leak from the top, the other window seems to be leak free.
I only redid the really bad leaker and so far think it much better seal.
With the 430, you got to smear it on the frame with a finger to thick coat, let it dry a little, then put window in place. Then I filled in the groove between window and frame. This will dry slowly and need refilling as it does shrink. What I dont know is how well this will hold up to the UV sunlight over many years. I plan to put some paint
on top of the goo.