Hard Adirondacks that are bare will most likely change a delicate silvery grey. You will want to sand these hardAdirondacks once annually, very marginally, with a 150 or 180-grit sandpaper. That is solely with the objective of "knocking down" any irregular blurry grain that might naturally occur because of exposure to the elements. It will also remove any bigger fibres 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 during the silver to exhibit the natural shade of the timber. The purpose is not to eliminate the silver patina but to simply maintain it easy and looking grand!