Re: Painting Garage Door

I don't think it makes any difference whether metal or wood in this case. You could of course strip it right down but from what you say it doesn't seem necessary. What I did with my own garage door is first make sure the old paint is thoroughly clean - using a softish broom and Mangers in a large bucket, then rinse liberally with water. (I find a broom ideal because it gets into any grooves as well as being practical on such a large surface.) Obviously allow to dry thoroughly then sand all over the door very well, making sure there's absolutely no loose paint. After that use the undercoat and topcoat. I stand to be corrected but I think you only need primer if the bare wood or metal is visible.
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