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How to paint a garage door
Pick a day with mild, clear weather to paint.
Climate conditions can have a big impact on the quality of exterior paint, especially when it's fresh. Try to schedule your project for a stretch that's not too hot, cold or humid.
Be particularly wary of precipitation, as excess moisture can easily undo all of your hard work. The next couple of days after you paint should also be clear in order to give new paint a chance to set properly.