1, in general, sprinkling water is to prevent the moisture in the mortar to be scraped up from being absorbed by the lower mortar, so wet the wall at the grass-roots level with water (without Mingshui) and then scrape and coat the anti-crack mortar, so that the bond after treatment will be stronger;

2. Taking concrete pouring as an example, the purpose of water conservation is for the hydration reaction of cement. If the volume is too large and the internal temperature is too high, cracks will appear on the surface, which will also affect the strength, so it is necessary to water and maintain and cover the geotextile.

Scraping crack-resistant mortar, the thickness of mortar itself is not large, at the same time, the general proportion will consider water-retaining agent, its role is to make the mortar lose water less quickly after construction (for the same reason as the first point), so that the cement has enough hydration time and enough operation time, so there is usually no special regulation on this point in the specification.