I'm second to that, though from a different angle. The regular silver (right - water-resistant-only) duct tape works just fine if you aren't really scuba diving with it. If still not sure - add a pair of good ziplock bags to the equation. All of the above (leaking) is due to the improper equipment use (PSK is not a purse, not reading instructions and specs, lack of checking for defects beforehand, unnoticed foreign particles in closures, skipping seals maintenance procedures, not following long storage recommendations, e.t.c.). Know your gear, especially if it's a professional high tech one - it's not fool proof.