Typically, you don't attach C9 lights directly to stucco. The problem with gluing them to stucco is that it can damage the surface when the lights are removed, leading to costly repairs. Instead, you should attach the lights to the gutter, metal trim, or other non-stucco areas. I don't recommend gluing Christmas lights because it can cause damage and isn't practical. Focusing on rooflines and other similar installations is not only safer but can also be more profitable.
