Two types of Steam-A-Seam are available. The bond is the same but you may prefer one over the other depending on your project. The original, Steam-A-Seam Sticky Back, has the pressure sensitive adhesive (the "stick") on one side which allows for a temporary hold to the appliqué material. It shifts easily on the second material allowing you to quickly reposition your appliqué pieces until pressed with an iron for a permanent bond. Once fused the bond is the same as Steam-A-Seam 2. Steam-A-Seam 2 Double Stick has the pressure sensitive on both sides which allows for a temporary hold to both the appliqué material and the background material. You can hold your project vertically and the appliqué pieces stay in place and are still repositionable until fused with an iron. Before fusing, tack your project to a wall or try on a garment to check appliqué placement. You're able to reposition pieces while you're wearing them. Once fused the bond is the same as the original Steam-A-Seam. PLEASE NOTE THE ORDER SIZE REQUIRED BY THE WARM COMPANY. ($185.00 EXCLUDING SHIPPING COSTS)ORDERS PLACED FOR LESS THAN THE MINIMUM IS SUBJECT TO AN ADDITIONAL FEE OF $20.00 IMPOSED BY THE WARM COMPANY.