Can this be used to cover a painted deck?

Thank you for your question. We apologize for the delay in response. We recommend removing loose splinters and replacing 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