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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.

The length of time shouldn’t matter much if you stick with lightweight Christmas lights and similar decorations. Those shouldn’t pose risks to your stucco. You should avoid attaching anything to your stucco that could fall because it’s too heavy, which may take part of the stucco with it. Some methods, like using double-sided tape or adhesive hooks, will naturally wear out over time and lead to falling lights, so don’t expect to leave these lights up year-round.

The best exterior paint finish for stucco is a flat or low-gloss finish. A high-gloss finish will show imperfections in the stucco and give it a candy-coated look that many homeowners don’t like. The best types of exterior paint to use on stucco are acrylic, masonry, and elastomeric. However, acrylic is recommended because it is both durable and breathable.