Analysis of the cause of wall scraping putty

Common issues in wall-finishing putty construction often result in cracks, blisters, peeling, and falling off of the putty layer. These problems can be attributed to several key factors:

One major cause is weak adhesion between the putty and the base surface. If the base is not cleaned properly or treated incorrectly, residual substances like release agents, oil, or acids may remain on the surface. This prevents proper bonding. Additionally, if no alkali solution is applied to remove wall oils, or if the adhesive is not used correctly, the bond strength can be significantly reduced. Studies show that a well-prepared base can increase bonding strength by 5–9 kg/cm², while the right emulsion can boost it further by 4–7 kg/cm².

Another common issue is applying the putty too thickly. The thickness depends on the material and mix ratio. For example, using white putty with excessive talcum powder can improve workability, but if overused, it can lead to a thicker coating. Coarser particles may reduce lubricity, making it harder to apply evenly. To avoid this, it's important to adjust the proportions of white powder and talc appropriately during mixing.

Some cracks are caused by structural movement rather than the quality of the putty or the application method. However, other issues, such as improper timing between layers, can also contribute to peeling. If the first layer isn't fully dry before applying the second, shrinkage can occur, leading to peeling and detachment.

In summary, proper surface preparation, correct material ratios, and adequate drying time are essential for ensuring a durable and high-quality putty finish. By addressing these factors, many common construction problems can be effectively prevented.

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