1. Clean the working face, remove the protruding part and fill the concave part.
2. Concrete or brick wall shall be primed with 1: 3 cement mortar, or the thickness shall be 5-7mm according to the design requirements, leveled and straightened, and the cover ash shall be 1: 0.3: 2.5, or the cement mortar shall be used according to the design requirements, and the proper thickness shall be maintained, and the oblique angle thickness of the external angle shall be about 1mm from both sides of the coating.
3. The interior wall of the plasterboard wall house should be round to protect the corners. At the external angle of 90 degrees, the internal wall external angle is cut into a slope of 1cm with a marble machine, hacksaw and knife, and leveled with mortar or gypsum slurry.
4. According to the actual required length, the fillet corner protector is cut into 45-degree plane 90-degree angles for nodes with 90-degree internal walls, and equally spaced tenons for nodes with 90-degree internal walls on three sides.