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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Depends entirely on what you’re gluing. As people have pointed out, textured surface = more surface area within the same area. Which is normally good.
But if you’re gluing something like a broken piece of a statue back together, and both sides are already perfectly smooth (polystone has this problem a lot), you don’t want to rough up the surfaces necessarily, because they already fit together more or less perfectly. Doing any damage to the surface could cause the repair to be off-kilter or not hold as well, at least not in the position you want.
Rough up for joining two formerly unrelated surfaces.
Do not rough up if you’re trying to repair a clean break. At least with any substance I’m used to working with, which admittedly is not all of them by any means.
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