It will reduce the strength of concrete surface and lead to sand on the surface. If you don't wait for hardening, it will cause cement dilution and loss, and aggregate will be exposed. Maintenance can make the wall more flat, smooth, beautiful and comfortable, which is beneficial to the next working procedure such as tiling or scraping putty. If the plastering and curing of the interior wall is not done well, early dehydration will easily lead to hollowing, cracks and scratches.