You need to have foam for the tip and ribbon to wrap the tip in prior to taping it to the end of the blade. The tip must be at least half an inch long for thrusting.
Start by using the strapping tape longwise on the blade. If you get standard two inch tape it will tape three passes to cover the sword and will overlap. Then make your tip by wrapping your foam in the ribbon and taping it with the strapping tape so it will hold up to the thrusts you make to your opponents. Then take your main color of duct tape, black if that is what you are using and tape longwise down the sword, again overlapping but this time covering where the tip goes. You will also wrap the tip around in a circle to make sure it is secure. Before you put the blade color on you have to cover up the screw that holds the hilt on. Wrap the main color of duct tape around a few times. You can also use the strapping tape before applying the duct tape for added security. When you finish with that you take your contrasting color and make two strips for the blade edge. This is half the size of the actual piece of duct tape so one strip will make the blade. Make sure you only cut the pieces where the actual blade would be and not all the way to the end of the tip of the sword. Again the tape goes longwise down the sword.
Once you finish this taping you are done. You have a legal sword for heavy weapons. Do have it inspected by a marshal prior to fighting however to make sure you did not miss something. A fight practice is the best place. And since it is new you don’t want to try and test it during an actual fight where you could lose an important battle.