can Deck Correct it be applied over an existing stain

Hi, thanks for connecting. We apologize for the delay in answering your question. 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. Allow new concrete or masonry surfaces to cure for 30 days before coating with DeckCorrect. All my best, Dane @ Cabot Customer Support.