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How is putty layer craze caused, how should handle?
A. small cracks caused by dry and wet, temperature change or over-thickness scraping: it can be polished and brushed with wall occlusion to control the thickness;
B. For the big crack caused by excessive scraping, remove the wall brush occlusion and then proceed with putty;
C. For the big crack caused by the wall cracking, remove the post-painted wall occlusion, paste the grid cloth, and then conduct putty scraping. If the wall crack is large, the wall shall be treated;