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Add cup (100 g) of brown sugar, cup (85 g) of honey, cup (80 g) of orange marmalade jam, 2 tablespoons (30 g) of coarse mustard, and 1 tablespoon (15 g) of spicy brown mustard to a small saucepan. Allow the mixture to heat on the stove on medium low until the sugar dissolves, which should take 5 to 10 minutes. Whisk the mixture constantly as it heats to help the sugar dissolve. Set an 8 pound (3.6 kg) spiral sliced ham in a large slow cooker. Use a pastry or basting brush to apply the glaze all over the ham, and pour some of it between the layers of the meat. Set the lid on the slow cooker, and turn it on at low heat. Allow the ham to cook for 6 to 8 hours. You'll know the ham is done when it reaches an internal temperature of 140F (60C). Use a digital thermometer to check on the meat starting at the 6 hour mark. While the ham is cooking, check on it every two hours. Apply more of the glaze if desired to ensure that the meat is as flavorful as possible. When the ham is finished cooking in the slow cooker, carefully remove it and place it on an oven-safe platter. Next, preheat the oven's broiler for 3 to 5 minutes. Take 1 cup (237 ml) of the cooking liquid from the bottom of the slow cooker and transfer it to a small saucepan. Heat it on the stove over medium heat until it comes to a simmer. Allow it to simmer for 5 minutes. After the cooking liquid has simmered for several minutes, begin mixing 1 to 3 teaspoons (3 to 9 g) of cornstarch into the pan. Add it 1 teaspoon (3 g) at a time, mixing it in well until it reaches your desired thickness. Once the glaze has thickened enough, brush it over the ham. Be sure to apply some between the layers of meat so the ham has plenty of flavor. Set the ham on the second to lowest rack in the oven under the broiler. Allow it to broil for 5 to 10 minutes or until the glaze becomes shiny and thick. When the ham has broiled long enough, take it out of the oven. Allow it to cool for 3 to 5 minutes, and serve while it's still warm.

Summary:
Heat the brown sugar, honey, marmalade, and mustards until the sugar dissolves. Place the ham inside a slow cooker and baste the ham with the glaze. Cover the slow cooker and cook the ham for several hours. Baste the ham every couple of hours. Transfer the ham to an oven-safe platter and preheat the broiler. Add some of the cooking liquid to a pan and simmer it for several minutes. Mix the cornstarch into the liquid until it thickens. Brush the thickened mixture onto the ham. Broil the ham for several minutes until the glaze is shiny. Remove the ham from the oven and serve.