Welcome from sunny Southern CA wifeofblacksmith. I like the idea of steaming batting because I have found W&W does shrink on my art quilts. Even though everything is smooth when the quilt is longarmed, after pressing, the fabric isn't smooth and I think it's the batting that shrinks.
And thank you, wife of blacksmith for that hint about adding another layer to your practice sandwich so you can use it again! I always practice a bit before I go to the real thing. I need that warmup. I learned to fm by making a detailed vest. That was more motivating for me than doing samples, but I did like threedognight's class project.