The widshield adhesive you're talking about.
Is Urethane adhesive.
properly applied, it has a tensile strength of around 170,000 psi.
Great stuff, carcenogenic, so keep it off your skin.
But it is UV sensitive.
Which means that over time, it will break down from sunlight exposure.
"Bye" Bye" Riceboy
(Ex-wife fore sale... take over payments)