Concrete Countertop Solutions BPF-001 8' Bendable Z Poolform 8 per Case. Z Poolform is a reusable PVC form used to create decorative concrete copings for swimming pools. Interchangeable Form Liners will allow for a variety of different edge profiles and textures. Z Poolforms can be used with vinyl liner, fiberglass, or concrete pools. The bendable form will conform to as small as a 6" radius. These forms create a 3" tall concrete coping. With the Receiver Track or Liner Track (vinyl liner pools only), the finished height will be approximately 3-3/8" above the pool wall.