Karlash Brush-On Glue Gel is Formulated Perfectly for Silk and Fiberglass Wraps, Repairs and Strengthening Natural Nails Non-yellowing formula Gel Resin is versatile, offering maximum strength and flexibility for all nail works. Brush On Gels and Fiberglass System. "Professional Use" Karlash Brush-On Glue Gel is Formulated Perfectly for Silk and Fiberglass Wraps, Repairs and Strengthening Natural Nails Non-yellowing formula Gel Resin is versatile, offering maximum strength and flexibility for all nail works. Brush On Gels and Fiberglass System. "Professional Use"