Common Paint Defects in Stone-Effect Coatings and Preventive Measures

As the application scope of stone-effect paint continues to expand, issues arising during its application and use are increasingly drawing attention. Common defects primarily include whitening upon water exposure, excessively soft paint film, sand loss during spraying, and colour variation.

The first prevalent issue is whitening upon water exposure. When the paint film exhibits a whitening effect after contact with rainwater, it indicates insufficient water resistance. This is typically linked to poor water resistance of the emulsion or inadequate emulsion content. Solutions include selecting specialised emulsions with high water resistance and appropriately adjusting the formulation structure to enhance overall water resistance.

The second issue is an excessively soft paint film. If the film remains easily scratched by a fingernail after several days under normal curing conditions, this indicates suboptimal film formation. Possible causes include mismatched emulsion film-forming temperatures with the application environment or insufficient film-forming aids. This can be addressed by selecting emulsions suitable for the ambient temperature and appropriately adding film-forming aids.

The third issue is sand loss during spraying. Sand loss not only impedes application efficiency but also leads to material wastage. Primary causes include improper sand particle size distribution or excessively low coating viscosity. Optimising sand grading while increasing system viscosity will stabilise the spraying process.

The fourth issue is colour variation. This may stem from variations in raw material batches, uneven application thickness, or environmental fluctuations. To minimise colour differences, ensure consistent raw material batches, standardise application procedures, and avoid arbitrary formulation adjustments under conditions of significant temperature and humidity variation.

In summary, the occurrence of stone-effect paint defects relates both to material selection and construction techniques. Only through concurrent efforts in formulation design, raw material control, and on-site management can project quality be effectively enhanced and subsequent maintenance costs reduced.