100 vinyl adhesive 16 oz can only be used with the applicator cap on clean surfaces. Cut a round circular patch for best results. For inflatables and light gauge vinyls, apply adhesive to patch sparingly and press tightly to surface to be repaired. Allow your repair to dry for 24 hours. A face mask or underwater goggles should always be used when going underwater to make repairs. For deep underwater repairs, cut round corners on the patch. Apply the patch and fold patch over upon itself. When you reach the damaged area under water, unfold the patch and apply immediately to liner, squeezing out all water bubbles.