Put on a dust mask for protection against hazards. Clean the area thoroughly with soap and water and dry it off with a clean cloth. Allow the surface to dry completely.
Sand the area down with 18, 24 or 36 grit sandpaper to a consistency that is not too smooth, but does not have rough edges either. This will give the compounds a good surface to which they can adhere..
Apply self-hardening putty to areas with small punctures. Follow the instructions on the putty for application and drying, as these may vary according to the manufacturer. Allow enough time for the putty to cure.
Mix epoxy sealer and putty to a rollable consistency. Apply this mixture with a paint brush or non-foam roller over areas with pinholes. Allow the mixture to set until it is dry to the touch.
Sand the repaired areas with sandpaper to roughen the surface. Apply one coat of epoxy sealer over the areas with a non-foam roller or brush. Allow the epoxy sealer to cure according to the manufacturer's instructions.
Apply a coat of no-sand primer to the repaired area and allow the primer to dry. Read the label to determine the allotted drying time.
Apply a coat of fiberglass anti-fouling bottom paint to the repaired area on the pontoon boat with a paint brush or anti-foam roller. Allow the area to cure.
