Solid Trane 4688 crystal glue is also called shadowless adhesive / quick drying glue / shadowless glue, one component, UV curing is essential for crystal imaging supplies. Crystal production generally use two kinds of crystal glue 250ML. Material is imported materials used in Italy, smell light, is the best choice for crystal. There is a Pk-8989UV shadowless glue, 250ML. This is the crystal film glue.