So, here are OUR instructions for a Crayola Crayon Canvas art!
The above canvas is an 8 X 10. I bought a pack of 10 canvas's at Michaels for $19.99
You can use ANY size, but note that the "melt area" will be smaller on a large canvas.
Here's where the fun starts! We let our canvas sit in the sun for about 10 minutes, but I don't think that is really necessary. I would strongly suggest that you use a "HEAT GUN" for crafting. I've read on several blogs that the person has a problem with "splatter" when they start the melting process. I really think that's because a hair dryer is more powerful (even on the "low" setting) and that's why it splatters. We used the crafting heat gun and had NO problems at all with splatter. It starting melting right away! (one blog said it took over 50 minutes for the melting process) Ours took maybe 15 minutes total. Place newspaper under the canvas, because it WILL (with any size canvas I think) melt all the way down the front. Like I said, the larger the canvas, the smaller the melt area will look.