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Once the rough shape is established, there are usually pinholes and deep scratches from the aggressive (36-grit) sandpaper and blocking. The next step is to move up to 80-grit, followed by finishing putty. This is catalyzed with the same peroxide hardener as the first stage, but has much finer talc and more resin, making it flow out and fill in minor pinholes and imperfections. This filler gets blocked with 80- or 180-grit sandpaper, and sets up the repair to be primed, as a final stage of the bodywork.