Unzip float tube cover. Soak the tip of rag in soapy water and dab over the area suspected to be leaking. The hole will produce bubbles. Mark the spot with a pen, clean off the soapy residue then allow area to dry.
Prep surface using rubbing alcohol. Apply Aquaseal to extend 1 inch around hole on all sides. Allow Aquaseal to dry level 8 to 12 hours.