Have you ever remelted down bits of crayons in your oven or however to remake crayons for your kids? My son has a sensory disorder and gets something out of snapping crayons into tiny little pieces. Which is cool and all but now the baby wants to eat them lol. So I was thinking of making them into bigger toddler crayons but not really sure what to use as a mold? Or do you just use a cookie sheet and cut them latter? Do you use wax paper or cooking spray to get them back out? How did you do it?