How to Make New Fence Boards Look Like the Old Ones, Wood Aging One of the recent hurricanes or storms damaged your fence. Or maybe some of the boards rotted. Or maybe termites made a meal out of your fence and you had to replace a portion of it with new wood. The new boards stand out like a sore thumb because they're brand new and not weathered yet. There's an easy way to make those new fence boards look almost identical to those old boards in about two days. What You'll Need White Vinegar Instructions (Cedar Boards) Put the steel wool in the white vinegar for a few hours or a few days. The longer you let it steep, the darker the solution will be. Keep in mind you may have to adjust the amount of steel wool you use and you will have to keep an eye on the solution to make sure the color is right. Once the solution is about the right color, remove the steel wool. Again, you may also use nongalvanized nails, but 0000 steel wool works best.