After-Sales Data Comparison: The "Troubles" of Natural Stone vs. the Convenience of PU Stone

   Suppliers who have been in the wall material business for several years know that after selling a batch of goods, they will definitely receive some calls from customers—not for replenishment, but for problems.

   An interesting phenomenon is: customers complaining about natural stone have a wide variety of problems; while those complaining about PU stone usually have only a few types of problems. The difference in after-sales data between the two types precisely reflects the essential differences between these two materials.

1.After-Sales Data of Natural Stone – Many Problems, Unclear Responsibility

Common Complaints About Natural Stone

• Appearance Issues (Most Common): Severe color difference upon arrival, texture inconsistent with the sample
• Quality Defects: Multiple fractures in the stone, obvious traces of artificial patching, disputes between "artificially synthesized" and "natural"
• Installation Issues: Hollowing, cracking, efflorescence (precipitation of white salt frost on the stone surface), difficult post-processing
• Construction Period Interruption: Inability to install due to unqualified stone, leading to construction period suspension and associated losses
• After-Sales Evasion: Merchants refuse to return goods or refund money, and do not acknowledge quality problems

Some Specific Data

   Industry analysis reports show obvious pain points in the stone decoration engineering field: data from the Ministry of Housing and Urban-Rural Development's Engineering Quality Complaint Platform shows that in 2022, complaints about stone decoration projects accounted for 23% of the total complaints in the building decoration category. Problems such as hollowing, color difference, and cracking accounted for more than 65%, the rework rate was as high as 35%, directly increasing the project cost by 15%-20%.

2.After-Sales of PU Stone – Not None, But Very Few

   Unlike natural stone, PU stone is a product of standardized factory production. Feedback from hundreds of actual projects shows that after-sales problems of PU stone are extremely rare, and almost all can be attributed to the following three categories:

Core Conclusion: PU stone itself barely causes after-sales problems. The "problems" reported by customers are mostly caused by the installation link, not material defects. As long as the installation is correct, PU stone basically requires no further attention after being installed on the wall.

3.Why Does PU Stone Have Fewer After-Sales Problems?

Summary: After-sales problems of natural stone mostly come from the uncontrollability of the material itself. As an industrial product, PU stone has stable performance and uniform quality. After-sales problems are mainly concentrated in the installation link—which is a problem that can be solved through technical guidance, not a defect of the material itself.

4.Procurement Case – After Renovating an Old House in Xiamen, the Purchaser Regretted Not Switching to PU Stone Earlier

Project Background

   At the end of 2024, "Banshan Courtyard", a homestay in the old town of Xiamen, carried out exterior wall renovation. The building was built in the 1990s, with load-bearing brick-concrete hollow blocks. It has a total height of 4 floors, and the area to be renovated on the exterior wall is about 210 square meters. The construction party was worried about the local coastal typhoon season and potential hidden dangers of wall load—natural stone would significantly increase the building load, and in Xiamen's coastal environment with high humidity and high salt spray, the risk of efflorescence and cracking is extremely high.

   The purchaser initially planned to use natural stone but found that the load of the light wall was seriously over-limit and steel structure reinforcement was necessary. After evaluation, it was confirmed that the natural stone plan was not feasible.

Choosing Haining Longtime and PU Stone

   Through an industry exhibition, the purchaser came into contact with Haining Longtime Industry Co., Ltd. The procurement list is as follows:

Material Selection and Installation

   Installation Points: Check the bearing capacity and flatness of the base course; cut on-site according to the drawing size with a woodworking electric saw; paste with special PU stone glue, and assist with pneumatic nail fixation along the edge (dry-hanging method); leave a uniform 3mm gap between panels and treat with supporting flexible sealant.

   Construction Period Calculation: From the arrival of goods on site to completion, it took a total of 15 full working days, which was significantly shorter than the estimated 90 days of the natural stone plan.

Usage Follow-Up and Recent Feedback from the Purchaser

   The project was completed in December 2024 and has been in use for more than a year. In a WeChat interaction in November 2025, the procurement manager said: "Typhoon Connie (with a maximum wind force of 17 levels near the center) landed in Xiamen a few days ago. The wind here was very strong, but the stone-like wall panels on the exterior wall showed almost no changes.    Looking back now, it was the right choice to insist on choosing light panels. The neighbor next door chose to paste natural stone at that time, and now they have started waterproof repairs."

5.Longtime PU Stone Test Report

6.Summary

   From the data perspective, the rework rate of stone decoration projects in 2022 was as high as 35%. A considerable part of this was caused by natural stone. As an industrial standard product, PU stone avoids material defects such as "color difference", "cracking", and "hollowing and efflorescence" to the greatest extent, thus ensuring the long-term use safety and low complaint risk of the project more than natural stone.

Haining Longtime Industry Co., Ltd.

   Founded in 2003, Haining Longtime Industry Co., Ltd. has four major production bases with an annual output value of 150 million RMB. Its products are exported to 55 countries including the United States and the United Kingdom, making it one of the leading enterprises in the PU stone wall panel field.

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