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Solid, unpainted stucco shouldn’t suffer damage from dots of glue used for this task. If the stucco is dirty, you may notice slight marks when you heat and peel the glue away, but these aren’t permanent.

However, not all stucco walls are solid stucco. Some are “faux” stucco with a foam backing. This kind of stucco veneer is more susceptible to damage, including damage from hot glue. We don’t suggest attaching anything to these kinds of stucco walls, so make sure you check the stucco type before starting this project.

The decision to repair or replace stucco depends on the extent of the damage. For minor issues like small cracks, holes, dirt, stains, or discoloration, a repair is typically sufficient and more cost-effective. These issues can often be resolved with a simple repair, a deep clean, and possibly a new coat of paint. However, for more significant problems such as large cracks, peeling, mold, algae, or structural water damage, a replacement might be necessary. In these cases, it is best to call a professional stucco contractor for an inspection. An expert can assess the severity of the damage, determine if there are deeper issues, and advise whether a repair is adequate or if replacing a section or an entire wall is the more cost-effective, long-term solution.

To repair damaged exterior stucco, you’ll first remove all loose and crumbling material from the damaged area. You then need to thoroughly clean the area and dampen it to ensure proper bonding. After that, you’ll apply a bonding agent to the repair area, then apply new stucco in layers, allowing for curing time between each layer. The final coat should be textured to match the surrounding stucco pattern as closely as possible. Once fully cured, the repaired area can be painted to match the rest of the wall if needed.

It’s not advisable to use CLR on stucco. CLR is a powerful acidic cleaner designed for removing tough mineral stains. Stucco is a porous material commonly made of cement, lime, and sand. The acidic nature of CLR can potentially damage or etch the stucco surface, leading to discoloration or deterioration. 

It is best to use cleaning solutions specifically formulated for stucco or mild household cleaners mixed with water to clean stucco siding. Always test any cleaning product in a small, inconspicuous area before applying it to the entire stucco surface.