Why is it good to “rough up” a surface to be glued? Wouldn’t a smooth surface give the best adhesion?
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Have you heard the reason they say why the brain has so many wrinkles? It’s because the wrinkles give more surface area, which means there can be more “brain” in the same space. A similar thing is true for glues. A rough surface gives more area for the glue to stick to. All those little bumps and crevices provide that extra surface area.
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