I add tylose powder to my fondant if I need it to be more sturdy and less apt to break. Wilton makes a product called Gum-tex which is usually available at stores like Hobby Lobby and Michaels. I also use this to make edible glue by combining with water and it works great. I think the trick is to make sure and warm the gum paste in your hands so it gets really soft and pliable. You can also rub a little shortening in your hands and knead it in. I have bought the pre-made Wilton stuff and it’s garbage… hard as a rock and had probably been sitting on the shelf since 1987. It was unusable and I had to toss it.