Key Points for Applying Fire-Resistant Coatings with Attention to Detail
2026-03-20
The quality of fire‑protective coating application significantly affects the material’s fire‑resistance performance; therefore, attention must be paid to the coating’s workmanship. While the application methods vary slightly among different types of fire‑protective coatings—such as Yunnan steel‑structure fire‑protective coatings and Yunnan tunnel fire‑protective coatings—the fundamental construction guidelines remain consistent.
1. Prior to applying fire‑protective coatings, the substrate must undergo proper surface preparation to ensure it is clean and smooth. In particular, for steel structures, the steel framework should be derusted and treated with an anti‑corrosion coating before the fire‑protective coating is applied. It is advisable to apply a rust‑preventive primer to prevent new corrosion from developing prior to spraying the fire‑resistant coating. Additionally, all surface dust and contaminants must be thoroughly removed before coating.
2. Meet the environmental requirements for fire‑retardant coating application.
The ambient temperature during the application of fire‑retardant coatings shall be between 0 and 40°C, with the substrate temperature ranging from 5 to 45°C and the relative humidity not exceeding 90%. Ensure adequate ventilation at the worksite, with wind speeds no greater than 5 m/s and no drafts. Do not apply the coating when working outdoors or when condensation is present on the surface of the component being treated.
3. Fire-retardant coating application is primarily carried out by brushing.
For coating, brush application is preferred, though spray application is also acceptable. Apply each coat to a thickness of 10 mm to 20 mm, and proceed with the second coat only after the surface has dried to the touch. Allow sufficient time between coats—typically until the coating no longer sticks to the hand—until the specified thickness is achieved. Local touch‑ups should be applied by hand using a trowel.
4. Post-Coating Maintenance and Coating Storage
After the fire‑protective coating has been applied, proper curing and maintenance are essential. Newly sprayed coatings should be protected from rain and direct sunlight; at ambient temperatures, they will cure within 48 to 96 hours. The recommended storage temperature is between 4°C and 40°C; do not store outdoors or expose to direct sunlight. The shelf life of fire‑protective coatings is typically six months.
Here, the editor of Henan Huiquan Industrial Co., Ltd. specializing in tunnel fireproof coatings in Yunnan warmly reminds consumers: When selecting fireproof coatings, it is essential for consumers to acquire certain basic knowledge, so as to make an informed choice, avoid being deceived, and eliminate any lingering concerns.
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