Elka Bond Rigid HEAVY DUTY SYNTHETIC POLYMER FOR A RIGID BOND. The Elka bond range is a versatile product that can be used for a rigid fix for both solid wood and real wood engineered flooring or a flexible fix for solid wood floors. SPECIFICATION Coverage: 16m2 when used as directed, instructions on packaging FEATURES & ADVANTAGES For bonding solid and engineered flooring to concrete, cementitious screeds, flooring grade plywood, chipboard, hardboard and smoothing compounds where applicable. Suitable for use with solid and real wood engineered flooring.