Cracking plaster on exterior building walls sometimes presents a powdery condition. Here are the reasons for the powdering:
The cement quality in the material is substandard, resulting in a powdering phenomenon.
2. The material has overly fine sand and a high silt content.
3. Issue with rubber powder in polymer additives.
4. Due to weather conditions, the product's density powder floats to the surface before hardening, causing it to become powdery.

5. The skim coat was applied too thinly, resulting in the cement failing.

A crack-resistant mastic mortar is a new type of exterior wall crack-resistant dry powder thin plaster mortar made by blending silicate cement, selected aggregates, various polymer materials, additives, and crack-resistant mastic in a specific ratio. This material effectively controls cracking caused by factors such as plasticity, shrinkage, and temperature changes, preventing and inhibiting cracks, leaks, and other issues. Additionally, it improves the internal structure of the mortar through physical actions, optimizing its performance.