Should you pressure wash the deck first?

Hi, thanks for connecting. We apologize for the delay in answering your question. Proper surface prep of our DeckCorrect is this. Be sure surface is free of all dirt, mildew stains, loose wood fibers and other foreign matter. Surfaces must be sound and free of standing water. 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. Allow new concrete or masonry surfaces to cure for 30 days before coating with DeckCorrect. All my best, Dane @ Cabot Customer Support.