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You can use small bits that are up to 3/8 inch in diameter, or larger bits that are 1/2 inch or more in diameter. Make sure the bits you use are coated with carbide or diamond; this information is usually visible on the package. You can also use hole saw bits to drill into stucco.

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 curing time for stucco typically takes several weeks to fully complete. During the curing process, the stucco undergoes a chemical reaction and gradually hardens. It's important to note that curing is different from drying. While the surface of the stucco may dry relatively quickly within a few hours or days, the curing process continues beneath the surface, strengthening and solidifying the stucco. 

It's best to avoid excessive moisture exposure during the curing period, as it can impede the curing process. The exact curing time can vary based on factors such as temperature, humidity, and the specific stucco mixture used.

To maintain stucco, inspect it annually for cracks and clean the surface with a mild detergent. Seal any cracks promptly to prevent water infiltration, and reseal or repaint as needed to preserve its appearance.