Melted Crayon Canvas Art 1. Line a box of 64 crayons to the top of an art canvas. Remove the black and brown crayons to make the final result more vibrant. 2. To attach, use a hot glue gun to glue crayons to the canvas. 3. Once the crayons are attached and the glue is dry, blast the crayons with a hair dryer to make them melt. 4. Then, Watch as the colors bleed down the canvas, creating a beautiful, colorful mess.