The most cost-effective way for homeowners to enjoy their entry doors longer while protecting them from the damage of sun and rain is to paint them. Painting the garage door can add just as much to curb appeal as painting or staining the front door.
While staining and coating with urethane, the doors are a costly ongoing maintenance item, urethanes just do not hold up.
The products on the market, for coating the doors with urethane require you, as the homeowner, once a year or every couple of years, to lightly sand and recoat.
When wooden doors get damaged too badly, because they were not maintained, and the wood got damaged or has splitting panels, painting is the most cost-effective way to save your door. When properly repaired and painted the paint job can last up to 8 plus years, with just minor washing.