My garage doors are 33 years old, so they have been "restored" a few times. The most extensive involved replacing all the cheap composite panels with exterior grade plywood. Over time the composite panels had absorbed water and were bowed out about 3-4" in the center. It was a big job because the panels were not removable, so I had to cut the frames to get them out, then put in new molding to hold the plywood panels in place. Looking back I must have been crazy, since I could have replaced the doors in half the time. Every few years they need a good sanding and paint, and they look pretty good for their age. Oh yes, then the was the time my wife tried backing out without opening the door...
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