The basic treatment is the foundation of the coating project. The basic treatment includes: removing dust, oil and loose matter from the surface of the base layer; Alleviating or eliminating surface defects; Improve physical or chemical properties of base surfaces. Winter construction when the temperature of the substrate humidity is too low, cement substrate part with white phenomenon, at the bottom of the drying is not easy to determine, generally the mortar new substrate, maintenance period for more than 14 days in winter.

    The base of building coating construction is usually mortar, concrete and so on, among which lime and cement have very strong alkaline, mainly because contain a lot of calcium hydroxide. As the water in the base evaporates, the calcium hydroxide is brought to the surface and gradually reacts with the carbon dioxide in the air to form a neutral calcium carbonate, which makes the mortar and concrete tend to be neutral. When the base is dry, the alkalinity decreases correspondingly, which can meet the requirement of coating construction. If the base is too alkaline, the adhesion of the coating will be affected, and the coating will change color and fall off. Therefore, the ph of the base must be controlled.

    The basic treatment of water paint joining mainly includes the following procedures:

    (1) inspection of the base course. The condition of the base course is closely related to the performance of the coating after construction. Therefore, it is very important to conduct a comprehensive inspection of the base course before the decoration of the building. There are many kinds of architectural coatings, and suitable architectural coatings can be selected according to the conditions of the grassroots, and the selected coatings can also be used to check whether the grassroots meet the construction requirements. Surface conditions such as strength, flatness, ph, and cleanliness should be emphasized.

    (2) the purpose of cleaning the base course is to remove the adhesive on the surface of the base course and make the base course clean without affecting the adhesion of the coating to the base course. There are mechanical and chemical methods to clean the base. If the base drum is empty and pulverized, mechanical chisel and steel wire brush should be used to remove dust. Adhesives such as grease, film remover and sealing material on the base can be removed with organic solvents or chemical detergents.

    (3) the basic level of repair, clean up after the completion of the work at the grassroots level, should be timely repair the defects at the grass-roots level, such as cracks, holes, etc.) at the grass-roots level, according to the actual circumstances of the defects are patched by the appropriate materials and methods, to create a good base for exterior wall coating projects.