Hotfix Flatback Crystals have a flat reverse side that has been pre-coated with a heat-sensitive glue and they can be applied onto fabrics and materials using an iron (steam turned off) or a hotfix applicator. Hotfix Flatbacks are perfect for adding durable sparkle for segments such as bridal, dance, fashion, film and theatre.Non Hotfix Flatback Crystals can easily be applied to most surfaces by hand, using one or two component glues which are most suitable for the surface, use and project. Non Hotfix Flatbacks are perfect for adding sparkle for segments such as accessories, crafting, dance, embellishment, fashion, film, nails and theatre.