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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.

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.

You should aim to let stucco dry for at least 48 hours before it rains. While misting new stucco and keeping it moderately moist is important for strength and longevity, uncontrolled exposure to rain can lead to weak stucco that doesn’t bond properly. Rain can also affect the stucco finish and the color unevenly, leaving you with less appealing siding.

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.