Ready-to-use preparation for consolidation of weakened, absorptive building materials such as sandstone, weathered brick, etc. It can also be used to strengthen historical plasters, joints, cornices or stucco. It restores the original strength of materials that have lost their original binder due to weathering. Containing organic solvents, it is based on silicic acid ethyl esters. The amount of silica gel precipitation is about 30%.