URIK Gypsum Plaster is the highest grade of gypsum with Pure White in Colour and Hardness of about 40%. Our Gypsum Plaster can be Directly Applied to all Surfaces E.g. ACC Blocks, Red Bricks, Concert Walls, and Hollow Bricks etcâ?¦ Our Plaster doesnt need Sand, Cement plaster on the wall. The Coverage is 22Sq feet in a 25Kg bag with a thickness of 12mm. Our Gypsum Plaster is Finesses of >200 Mesh and purity over 99% that gives the best atomic bond and absolute mirror finish