(1) Preparation before construction: 1. Check the construction site and confirm the items that need to be rectified and prepared before construction. 2, confirm the construction area accounting dosage, check whether the paint dosage is consistent. 3, confirm the color scheme, check the paint color number and quantity. 4. The construction team should have on-site technical director, and the construction personnel should be trained in the early stage of construction. 5. Make sure to prepare suitable painting tools and auxiliary supplies. 6. Confirm that the rope fixation of the hanging basket is safe and effective, and the safety facilities for climbing operation are complete and effective. Accessories and supplies: putty knife, wire brush, putty scraper or scraper, putty tray, sandpaper, napping roller, combination brush, paint brush, portable electric mixer, filter screen, plastic bucket, leveling plate, steel tape measure, chalk line bag, textured paper, plastic protective glasses, masks, gloves, work clothes, rubber shoes and flat plate. (2) Substrate treatment and requirements: 1. Inspection and acceptance (1) The base course shall be smooth, clean and free of floating sand and empty shells. The moisture content of concrete and plastering surface should be below 65438 00%, and the PH value should be less than 9. Usually, under the condition of good ventilation, the newly applied base should be dry for 10 days in summer and more than 20 days in winter; Concrete has three weeks in summer and four weeks in winter. Without inspection, the grassroots shall not be constructed. (2) When frost is found on the wall, construction is prohibited, and construction can only be started after treatment. (3) Before the exterior wall coating construction, ensure that the hanging basket rope used for coating construction is firmly fixed. 2. Base repair (1) Small-area hollow wall repair ① Determine the hollow wall: ② Remove the hollow part with an electric cutting machine or impact drill; ③ Remove the dust and impurities on the surface. (2) Non-structural small cracks repair ① First find out where the cracks are; (2) If major structural damage and cracks are found, the owner and designer shall be immediately notified to take necessary measures; (3) If the crack is less than 2mm, special putty can be used to repair the external wall; (4) If the crack is larger than 2mm, it shall be treated as follows: a) Cut a V-shaped groove with a depth of 13mm along the crack with an impact drill or an electric grinder, and then remove the dust and impurities in the V-shaped groove. B) Inject polyurethane sealant into the V-shaped groove until it is slightly lower than the wall surface. C) Under good weather conditions, let the V-shaped groove filled with polyurethane sealant dry for 24 hours.