Painting front porch

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Repainting a deck.... do I have to scrub off all the old paint? - Do It Yourself - SurfTalk Painted Deck Floors, Deck Over Paint, Sanding A Deck, Grey Deck Paint, Painted Pool Deck, Painted Wood Deck, Wooden Pool Deck, Deck Paint Colors, Painted Deck

I have already power washed the deck and peel off the lose paints that are on the deck. But do I have to sand off the rest of the paint before repaint it? There are also some cracks I was told to use some wood putty(?) to fill them before painting. What's that?