Drying quickly Reasons 1.Due to the high temperature in summer, the water evaporates quickly during the operation of scraping wall putty, which usually occurs on the second stage of the construction. 2.Cellulose ether’s water retention is poor, qualified cellulose ether should own the capacity of keeping mortar at least two hours before scrapping. Hard to polish Reasons 1. It is more difficult to polish a wall when it’s too solid or polished during construction, which with increased density and stronger hardness of the wall putty layer. 2 The slow-drying wall putty will achieve the best hardness after one month. If it encounters water, such as wet weather, rainy season, wall seepage, etc., it will accelerate hardening and make it more difficult to polish, and the polished layer is rougher. 3 Different formulas of wall putty are mixed together, or the dosage of formula is adjusted incorrectly, so that the hardness of the wall putty after scraping is higher. Solutions If the wall is too solid and hard to polish, it should be roughed with 150# sandpaper first and then 400# sandpaper to modify the pattern or scrape two more times before polishing. Choose high quality cellulose ether in middle viscosity, with highly recommend for wall putty. Cracks  Reasons 1. External factors including thermal expansion and contraction, earthquakes, subsidence of foundations. 2. Incorrect proportion of mortar in the curtain wall will shrink and cause cracking drying. 3. The calcium ash was not sufficiently oxidized. Solutions External forces are uncontrollable, it is difficult to prevent and control. The scraping process should be carried out after the wall drying fully. For more questions plz contact us: www.jinjichemical.com