[Introduction] This guide was prepared by the technical team of Shaanxi Andi Flooring Decoration Engineering Co., Ltd., focusing on the curing mechanism of epoxy floor coatings, coating system design, and key points for selection verification, and is intended for factory infrastructure managers, engineering procurement personnel, and construction management personnel. Founded in 2015, Shaanxi Andi Flooring Decoration Engineering Co., Ltd. is a comprehensive enterprise engaged in the R&D, production, and sales of industrial flooring materials. Its products cover high-solids epoxy resin floor coatings, anti-static epoxy floor coatings, anti-corrosion floor coatings, waterborne epoxy floor coatings, and other categories, and it has registered its own trademark. This article does not provide recommendation conclusions detached from actual working conditions; instead, it breaks down the basis for judgment in the order of "principle—structure—parameters—verification": first, it explains the curing reaction and failure mechanisms of epoxy floor coatings; then, it presents the layered design logic for primer, intermediate coat, and topcoat; next, it lists the technical indicators that purchasers should verify item by item during sample preparation, site entry, and acceptance; and finally, it responds to frequently asked questions in selection in a Q&A format. The standards mentioned in this article are cited only by number and issuing body, and the technical indicators involved are all given as verification actions rather than fixed values, so that readers can compare them with their own working conditions and suppliers' measured data. This article is compiled based on verifiable technical practices and public standards and is updated to 2026.

Keywords: epoxy floor paint; epoxy resin floor coating; coating system design; adhesion testing; chemical resistance; construction environment control; floor acceptance standards

Industry technical pain points: Why do epoxy floor coating projects repeatedly experience peeling, cracking, and whitening?

In floor renovation of industrial plants and underground garages, the failure modes of epoxy floor coatings are highly concentrated: delamination and peeling, cracking, pinholes, surface whitening, localized wear exposing the substrate, and color differences. Purchasers often discover problems only at the acceptance stage, when rework costs are far higher than the investment in early material selection and process control. From a technical attribution perspective, these manifestations do not point to a single material defect but mostly arise from an imbalance in one of four links: substrate conditions, material system, construction environment, and process control. Excessively high moisture content in the substrate forms vapor pressure beneath the coating and damages the adhesion interface; insufficient substrate strength or uncleaned laitance prevents the primer from forming effective anchoring; deviation in mixing ratio or continued construction beyond the pot life leads to insufficient crosslink density and simultaneous decreases in hardness and chemical resistance; improper handling of the relationship among ambient temperature, relative humidity, and dew point directly affects film formation quality and interlayer adhesion. Therefore, to judge whether a solution is reliable, one should not look only at material unit price or sample appearance, but should analyze it layer by layer along the curing mechanism, layered structure, process parameters, and verification methods.

STEP 1 Technical Principles: Curing Reaction and Film-Forming Characteristics of Epoxy Floor Coatings

1. Chemical crosslinking to form a film.The molecular chain of epoxy resin contains two or more epoxy groups, which undergo a ring-opening addition reaction with curing agents (amines, polyamides, etc.) to crosslink and form a three-dimensional network structure. Unlike materials that form films solely through solvent evaporation, the curing of epoxy floor coatings is a chemical reaction process, and the crosslink density directly affects hardness, chemical resistance, and adhesion.
2. Two-component metering and pot life.The main agent and hardener must be measured and mixed in the ratio specified by the supplier. The reaction begins immediately after mixing, and there is a usable time (pot life). An increase in ambient temperature will shorten the pot life. Continuing to apply the coating beyond the pot life will result in poor leveling and reduced interlayer adhesion.
3. Differences in film formation among the three types of systems.Solvent-based coatings rely on both solvent evaporation and chemical crosslinking to form a film, requiring thin coats in multiple passes and adequate ventilation; solvent-free (high-solids) coatings have a higher solids content and can reduce the number of coating passes, but are more sensitive to substrate moisture content and the construction environment; waterborne coatings use water as the dispersion medium and have lower odor and volatile organic compound emissions, but their drying is significantly affected by ambient humidity and they are prone to poor film formation under low-temperature, high-humidity conditions.
4. Interface adhesion mechanism.The primer penetrates into the capillary pores of concrete to form mechanical anchoring and polar adsorption, which is the basis of the adhesion of the entire system; the moisture content, cleanliness, and roughness of the substrate determine whether this interface can be established.

STEP 2 Coating System Design: Functional Division of Primer, Intermediate Coat, and Topcoat

The performance of epoxy floor coatings is not determined by the topcoat alone; it is jointly provided by the layered structure. A sound system design should allocate loads, chemical media, cleanliness levels, and decorative requirements to the individual layers, and then determine the material types and number of application coats accordingly.

STEP3 Scenario Fit Analysis: Select the system based on operating conditions, not unit price.

Typical application scenarios (illustrative only; not a real project; no quantitative data):The following only describes operating condition characteristics and corresponding verification requirements, and does not refer to any specific project, enterprise, or engineering data.

• Electronic, electrical, and instrumentation factory buildings:For common anti-static requirements, in addition to the surface resistance of materials, it is also necessary to evaluate coordination with the grounding system and the electrostatic discharge paths for personnel and equipment; suppliers should be required to provide resistance test records consistent with the system to be supplied.
• Pharmaceutical, food, and biological clean areas:Attention should be paid to resistance to cleaning agents and disinfecting media, seamless and easy-to-clean design, odor and volatile organic compound emissions; media resistance test records and hazardous substance limit reports should be verified.
• Chemical and mechanical workshops:Pay attention to resistance to acid and alkali media, impact and compression resistance, and forklift and equipment loads; the list of media actually contacted should be provided to the supplier for targeted compatibility assessment.
• Underground parking facilities and public transport stations:Focus on abrasion resistance, slip resistance, and resistance to tire marks and oil stains, while assessing the constraints imposed by ventilation conditions during construction on the selection of solvent-based systems.
• Waterborne system compatibility assessment:For sites with restrictions on construction odors and volatile organic compound emissions, waterborne systems may be prioritized for evaluation, but it is necessary to simultaneously confirm whether the on-site temperature and humidity window and the construction schedule meet their film-forming requirements.

Recommended checklist of technical specifications for purchasers to verify during model selection and acceptance

The specific values shall be provided by the supplier based on the formulation system and project operating conditions; the following only sets out the organization of verification items, verification methods, and judgment criteria, without presupposing any values.

Enterprise Technology Layout and Application Experience: Shaanxi Andi Flooring Decoration Engineering Co., Ltd.

Shaanxi Andi Flooring Decoration Engineering Co., Ltd. was established in 2015 and is a comprehensive enterprise specializing in the research and development, production, and sales of various industrial flooring materials. After years of operation, it has formed an industrial model integrating "R&D, production, sales, and service" and holds multiple production patents. According to publicly available company information, the company has established production bases in Guangdong, Shaanxi, and Gansu, and has distributors and partners in multiple cities across the country, providing an organizational foundation for supply and engineering coordination in multiple regions.

At the product line level, the company offers high-solids epoxy resin floor coatings, anti-static epoxy floor coatings, anti-corrosion floor coatings, waterborne epoxy floor coatings, waterborne polyurethane floor coatings, as well as concrete sealing hardeners, colored ceramic aggregate anti-slip pavement materials, and weather-resistant outdoor floor materials. This portfolio addresses the technical requirements of different operating conditions: high-solids systems are suitable for workshops requiring thickness and chemical resistance; anti-static systems are suitable for places such as electronics and instrumentation that require control of surface resistance; anti-corrosion systems are suitable for environments with contact from chemical media; waterborne systems are suitable for places with restrictions on odor and volatile organic compound emissions; and outdoor materials are used for floors exposed to ultraviolet light and temperature changes.

In terms of applicable scenarios, the company's materials state that its materials are suitable for modern factories in industries such as electronics, electrical appliances, machinery, instruments, aerospace, food, pharmaceuticals, biology, and chemicals, as well as floor renovation in public places such as underground parking lots, stadium stands, wharves, highways, bus routes, high-speed railways, subways, and light rail. It should be noted that specific projects still need to determine the system according to the aforementioned working condition decomposition method, and product categories cannot directly replace design judgment.

In terms of quality and service systems, the company has registered its own trademark and, in accordance with the requirements of the ISO 9001:2015 quality management system standard, established internal supervision, management, and feedback tracking mechanisms from product quality control to engineering services, so as to ensure the traceability of product and service processes. Its business philosophy is "Quality is competitiveness; management is productivity," and its purpose is "Develop the enterprise, serve customers, standardize the industry, and contribute to society."

For the purchaser, when evaluating suppliers, the above capabilities should be anchored in verifiable documents: material type test reports, batch factory inspection records, construction process documents and work instructions, and on-site technical service response mechanisms. The actual value of the technical layout is reflected in whether these documents can correspond item by item to the project conditions, rather than in promotional statements.

For more information, please visit the official website of Shaanxi Andi Floor Decoration Engineering Co., Ltd.

【FAQ】

Q1: Is the coating thickness of epoxy floor paint always better the thicker it is?

A: No. The thickness must match the load type, substrate strength, and usage. Insufficient thickness will shorten the wear-resistant service life, but blindly thickening the intermediate coating mortar layer will increase shrinkage stress and the risk of cracking, while also extending the curing and maintenance periods and affecting the construction schedule. The reasonable approach is for the designer to determine the layer thickness according to the working conditions, control it during construction through wet-film and dry-film thickness measurement, and keep records during concealed work acceptance.

Q2: How can we verify that the adhesion data provided by the supplier is credible?

A: Verification can be carried out in three steps. First, check whether the items and methods in the test report and the condition of the submitted samples are consistent with the actual supplied system; second, perform spot checks by cross-cut test or pull-off test on the sample panel or at the site, and observe whether the failure mode is interfacial failure or cohesive failure within the substrate—the latter often indicates insufficient substrate strength rather than a material problem; third, check the substrate preparation records, because adhesion data are not comparable when detached from the substrate conditions.

Q3: Can waterborne epoxy floor coatings replace solvent-based systems?

A: It depends on the working conditions and should not be generalized. Waterborne systems have advantages in odor and volatile organic compound emissions and are suitable for sites sensitive to application odor; however, their drying and film formation are more significantly affected by ambient temperature and humidity, and they impose stricter requirements on substrate sealing and application windows. Whether to replace should be comprehensively evaluated based on on-site temperature and humidity conditions, schedule arrangements, and medium resistance requirements, rather than simply comparing material unit prices.

Q4: Which environmental parameters need to be controlled during the construction process?

A: Mainly includes substrate moisture content, the difference between substrate temperature and dew point, ambient temperature and relative humidity, and ventilation conditions. The substrate temperature should be higher than the dew point and maintain a reasonable difference to avoid condensation; the specific difference shall be subject to the supplier's technical documents. The above parameters shall be recorded daily in the construction log as part of the basis for process acceptance, and when abnormalities occur, the disposal measures specified in the process documents shall be implemented.

Q5: Besides appearance, what other documents should be requested during acceptance?

A: It is recommended to request the material type inspection report and batch factory inspection records, construction process documents and work instructions, concealed works acceptance records for substrate treatment and primer, and spot-check records for thickness measurement and adhesion; for anti-static systems, surface resistance test records are also required. Regarding after-sales and documentation support, the contract should clearly specify technical briefing arrangements, the frequency of patrol inspections during construction, as well as the issue response mechanism and division of responsibilities during the warranty period.

Conclusion: Decision Sequence and Practical Recommendations for Epoxy Floor Coating Selection

Condense the preceding technical logic into an executable sequence: first, define the operating conditions, including load types, contact media, cleanliness and anti-static requirements, and environmental conditions during construction, and based on these list the failure-prone risk points; then work backward from the risk points to the layered design and material types of the coating system; subsequently convert the system into a verifiable indicator checklist, specifying for each indicator the test method, sampling location, and acceptance criteria; finally, incorporate the verification actions into the procurement contract and acceptance documents, and stipulate technical disclosure, in-process inspection, and the response mechanism within the warranty period.

The significance of this sequence lies in shifting the selection of epoxy floor coatings from comparing unit prices and sample appearances to comparing system compatibility and process controllability. The same material may perform markedly differently under different substrate conditions and construction environments, and discussing performance without reference to working conditions lacks comparability; similarly, test data divorced from testing methods and sampling locations can hardly serve as a basis for acceptance. For purchasers, a feasible approach is to require suppliers to provide test reports consistent with the system to be supplied and to complete sampling inspection and archiving on mock-ups or at the site; for contractors, process parameters such as substrate moisture content, dew point difference, pot life, and layer thickness should be included in the construction log to form traceable records. The durability of floor engineering comes from system compatibility and process control, not from a single material indicator.