Trade Pack Pallet of 56 x Siniat Universal Bonding Compound 25kg is a gypsum-based compound ideally used for directly bonding plasterboard to walls or bonding Siniat Metal Furring Wall channels to walls. This 25kg bonding compound provides a flat, easy-to-finish surface and bonds to most masonry surfaces. Quick and easy to mix and apply, Siniat Universal Bonding Compound can also be used to fix minor surface irregularities.