I have made 3 full-sized crayon quilts. I sprayed the blocks on 2 of them with a spray I bought at Michael's. Don't remember the name. The One not sprayed has been washed over and over countless times, I made them to use.. DON'T WASh IN STRONG DETERGENT. NEVER IN HOT WATER AND ONLY AIR DRY IN DRYER OR DRY ON LINE ,FLAT ON FLOOR. HEAT WILL FADE THE CRAYON. I hope. This helps you.