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The longevity of paint on wood depends on factors like the quality of the paint, surface preparation, exposure to elements, and maintenance. Exterior paint on wood surfaces can last 5 to 15 years or more with proper care and maintenance. Interior paint tends to have a longer life span, often 10 years or more. Regular cleaning, touch-ups, and addressing any issues like peeling or cracking can extend the life of the paint. 

Whitewashing isn’t permanent, but it can last for a long, long time. When you apply it correctly or have a seasoned pro whitewash your brick, whitewashing can last for 20 to 30 years or longer. Whitewash is very durable and typically requires little maintenance, making it a great project for most DIYers.

While the answer varies based on weather, 10 a.m. is a good time to start painting. The dew will have dried, meaning there’s no moisture on the house, and the temperature will likely be moderate and the sunlight less direct. Starting mid-morning should also give you enough daylight and pleasant weather to work on the job for several hours.

On most untreated wood fences, there is no need to sand before treating. You typically only need to sand if there’s an old coat of paint or stain on your fence. If you do need to sand off a previous paint or protective coating (like an old stain or sealant), use medium-grit sandpaper.