Undercoat is used as a first coat for Gamazine It  strengthens plastering and also covers the imperfections of plastering like small holes and cracks It makes the surface to be perfect for Application of Gamazine, thus enabling our work to look beautiful And also it saves as waterproofing for the wall because although Gamazine is not affected by the rain but it does not play the roll of waterproofing 

We also use it to cover any unfavourable wall surfaces e.g. Painted surface, surface with moisture, degraded surface, etc