Place a 3-inch putty knife at a 45-degree angle on the deck just in front of the peeling Kool Deck coating, and then strike the handle of the knife gently with a hammer to peel the coating off the concrete. Do this with all of the Kool Deck coating that is peeling up.
Place a cold chisel at a 90-degree angle to the Kool Deck coating, and strike downward on the chisel with a hammer to break up the coating.
Place the 3-inch putty knife at a 45-degree angle on the deck just in front of the chipped Kool Deck coating, and then strike the handle of the knife gently with a hammer to scrape the coating off the concrete. Again, do this with all of the Kool Deck coating that you chipped.
Scrub the surface of the Kool Deck coating with a metal wire brush to remove the remainder of the coating from the concrete.