When it comes to using glue on glass, particularly a car’s windscreen, it’s not just about the adhesive’s ability to stick. The properties of glass require adhesives specifically designed for it, which can bind at a molecular level and remain clear for visibility. Most general-purpose glues aren’t formulated for this kind of task and may not create a durable or safe bond.
Moreover, the structural integrity of a car windscreen is vital for safety; it’s part of the vehicle’s protective shell. Using an inappropriate adhesive can weaken the windscreen, potentially making it more dangerous if you’re in an accident. For automotive glass, specialized products and professional application are essential to ensure the repair holds up under the stresses of driving.
Couple reasons, first, glass is really smooth, so it’s hard for the glue to get a good grip onto the glass. Think of how easy it is to run your fingers along a piece of glass vs a piece of wood. Glass also isn’t very porous, so even if another substance is feels as smooth, it might have tiny holes throughout its surface, which give the glue a bunch of anchor points to grab onto.
Second is the reason why a glue might initially adhere but then fall off later, glass and glue have different coefficients of expansion, so when they get up or cool, they getting bigger or smaller at different ratios. So as you drive through different weather conditions, the glue and glass will flex differently and the glue essentially peels itself off the window.
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