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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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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Think of it on the molecular level. A “rough” surface as plenty of places for molecules to stick together. A smooth surface has few. This is why rough surfaces glue better than smooth ones. More points of contact.

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