According to Instructables.com, sealing wax can be made using fabric hot glue, dye, bee's wax, a candle and a small aluminum dish in a safe working space. Depending on the type of dye used, it may have to be ground with a mortar and pestle (a rolling pin works just as well).
Start by placing a small metal bowl in a stand and putting a lit candle, such as a tea light, underneath. Continue by cutting off a small piece of bee?s wax, and placing it in a bowl to melt. Once the wax is melted, swirl it around the bowl to coat the inside, and add two 1-inch pieces of the fabric hot glue. Use a small wooden stick to mix the ingredients together. Immediately remove the mixture from the heat if the wax begins to bubble or pop.
Use a mortar and pestle or a rolling pin to grind the dye if needed. Add around 1/4 teaspoon of dye to the bowl, and mix in carefully. Heat the mixture until small bubbles appear and the mixture is runny. Prepare a long V-shaped piece of tinfoil, and pour the hot wax along the shape. Leave it to cool completely before removing the foil.