Clean the area around the gash with a clean cloth to remove any skin oils or oils from suntan lotion.
Cut two rounded patches that are 1 inch wider than the gash and about 2-inches long.
Apply a generous amount of the included cement to one side of a patch and have your partner hold the outside of the liner together.
Apply the patch with cement over the end of the gash and press into place firmly. Allow for at least 1/2 inch of the patch to cover the area around the gash. Apply cement to the other patch and apply to the outside of the liner in the same fashion. Allow the patches to dry for 30 minutes.
Cut additional rounded patches as needed to cover the length of the gash on the inside and outside of the liner.
Apply each pair of patches one at a time overlapping the last set of patches applied by at least 1/2 of an inch. Allow each set of patches to dry for 30 minutes before adding more patches and wait 12 hours before adding water to the pool.