[header] How to paint a garage door [title] Pick a day with mild, clear weather to paint. [step] 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. [substeps] The next couple of days after you paint should also be clear in order to give new paint a chance to set properly.