The Basics Flexbond is a non-toxic, water-soluble glue designed to be used on foam and other material. It's also an ideal primer.  The Uses Coats thermoplastics and foam with the same finish, allowing you to paint them without distinct surface differences. The Specs Available in: 16 oz. The Bottom Line A flexible, durable glue for thermoplastics, foam and other materials, designed for stage and screen use--and can be flexed and struck without chipping or cracking.