The traditional stone wetting installation is simple, easy to operate and low in cost. It is still widely used in stone installation projects. Therefore, it also brings a lot of stone disease after installation, the most remarkable phenomenon is stone water spots (stains) after drying for a long time. This question is plaguing many owners, construction units and stone suppliers. We will be analyzed the cause of the water spots (stains) we have encountered in our work.
Firstly, different stone varieties. The stone that does not dry with water spots (stains) is mostly light-colored stones, and most of the granite stones. It is characterized by medium-acid magmatic rocks, high degree of crystallization, abundant micro-cracks between crystals, high water absorption, and high content of various metal minerals. Based on these characteristics, when we do the wetting installation, it is easy to chemically react with the metal minerals in the stone, and result in water crystals. Under normal conditions, it is difficult to evaporate and dry, as a result the stone has a long-term appearance of flooding. Secondary, the use of protective agents or varieties is not properly selected. There are many varieties of protective agents in the market, and different protective agents should be used for different stone materials, different parts of use, and different paving methods. This is often overlooked. More important is the fair choice of construction methods and usage. It is often found that even we used the same stone, same cement and sand, but the wall cladding and flooring still  appear water spots (stains). This situation is basically the result of using a stone protective agents without actually operating requirements.  Thirdly, the choice of cement, sand and water consumption during stone paving also have a great influence on water spots and yellowing of stone. In the construction, the alkali content, manganese content, iron content, sand soil content (including impurities) and water should be strictly controlled. Otherwise, the stone will be contaminated by different procedures.