Detachment of murals is one of the most serious types of damage in Tibetan temples. Unlike the Potala Palace, the Tantric Temple is located in the Brahmaputra River valley where the environment is very humid. Capillary infusion of water into mural paintings is quite common due to varying underground water levels. Mixtures of potassium silicate and coal ash cannot be used as grouting material because they will cause murals detachments. In order to solve this problem, experiments were done both in the laboratory and onsite. It is found that a group of materials are made mainly by polyacrylic acid and blended with hydraulic lime mortar and clay can consolidate detached murals very well. The grouting material can prevent the mural salinization. The new materials tested should have extensive application to the restoration of wet murals in Tibet.