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In most cases, you have to sand crown molding before painting. This is due to the nature and design of molding. It’s not a flat wall, so uneven surfaces will be immediately noticeable once that paint dries. Sanding down the surface smooths everything out, leading to a satisfactory result. If the trim is already smooth, such as with new crown molding, you can give it a light sand with 120-grit sandpaper.

If you’re repainting with the same sheen, it’s possible to apply satin paint over satin. However, if you’re reducing the glossiness and using a flatter paint, you should sand first to take off some of the sheen. Sanding will also help the next coat of paint stick to the wall better, so it’s a good idea, even if you’re not changing the sheen.

Painting a driveway can be a good idea for specific situations. It offers aesthetic improvements, helps protect the surface from UV damage and stains, and can extend the driveway's life span. It's beneficial for driveways in relatively good condition that need a refresh or color enhancement. However, painting is unsuitable for severely cracked or damaged surfaces, as it won't address structural issues. Additionally, proper preparation, priming, and choice of paint are crucial for a successful outcome. 

The life span of paint on shutters depends on factors like paint quality, climate, and maintenance. High-quality exterior paint applied correctly can last 5 to 10 years. In mild climates with less extreme weather, paint may endure longer. However, exposure to harsh sunlight, rain, and temperature fluctuations can lead to more frequent repainting. Regular cleaning, maintenance, and timely repainting when signs of wear or fading appear can help extend the life of paint on shutters and maintain their appearance.