Here is what you need to do if you want to make an unpoppable balloon: 1) Inflate the balloon smaller in size than the skewer size you picked 2) Give it a knot properly after releasing some air to relax the rubber 3) Push an oil or dish wash soap coated skewer tip over the thick areas of the balloon 4) Continue pushing the skewer slowly using gentle pressure to the other side of the balloon 5) That's it, just keeping two holes on opposite sides, you can make an unpoppable balloon