Used this product on my front porch decking about 5 years ago. Can I reapply this same product over the old finish without sanding?

Thank you for taking the time to ask a question. In order to be effective, a stain must be able to adhere. Surfaces must be sound and absolutely dry. Be sure surface is free of all dirt, mildew stains, loose wood fibers and other foreign matter. Old loose stain should be scraped off and the edges sanded smooth for proper adhesion. Prepare previously stained or weathered surfaces with Cabot® Wood Cleaner to remove dirt and mildew stains or Cabot® Wood Brightener to revive extremely weathered surfaces. Scrubbing with a stiff bristle brush is required to completely remove all dirt and debris. Let the surface dry 24–48 hours after cleaning to ensure dry wood. If you have any questions, please contact us directly at 1-877-825-7727 or info@cbgbrandreview.com. Sincerely, R.C., Digital Care Team