Description Gyproc Plasterboard Adhesive is a gypsum based powder adhesive that is mixed with clean water and is used as a bonding agent to line bricks, blocks, concrete or sand and cement rendered walls with Gyproc plasterboards. Field of Application Used to bond a range of Gyproc plasterboards to many different types of background surfaces, providing a smooth crack-free surface with a small cavity allowing for electrical cables and small pipes.  It is not suitable for substrates exposed to moisture or for fixing plasterboards to ceilings. Gyproc Plasterboard adhesive mixed with water has a typical working time of 100 minutes.