Hard Adirondacks that are unfinished may typically change a soft silvery grey. You are going to desire to mud these hardAdirondacks once annually, ever-so marginally, using or 150 grit sandpaper. This is solely with the objective of "knocking down" any uneven blurry grain that may naturally occur because of exposure to the the weather. It will also remove any bigger fibers that separate out and could cause splinters. Additionally, it gives an appearance that is sleek as well as to the Adirondack furniture. Don't sand through the silver to expose the normal color of the wood. The motive just isn't to eliminate the silver aging but to merely keep it sleek and looking great!