I have been seeing a lot of adverts for transparent, waterproof glue which works on everything but glass. Since glass is not mentioned in the ads, I am scared to use it on a windscreen.
What happens when you use it on glass?
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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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