does this work on a old painted deck

Thank you for your question. We apologize for the delayed response. This product is a great option for older weathered surfaces. DeckCorrect covers and corrects worn, weathered, exterior wood and concrete. This thick coating is enhanced with Polycarbonate Everbeads to fill cracks up to 1/4" and lock down splinters for a durable, dirt-resistant surface. Remove loose splinters and replace severely damaged or rotting wood. Prepare previously stained or weathered surfaces with Cabot Problem-Solver Wood Cleaner, Wood Brightener or Wood Strippers. On severely weathered surfaces, sanding may be required to completely remove all loose wood fibers. Fill larger cracks with an exterior wood filler. Sincerely, Alex Cabot Customer Support