One. What are the causes of cracking in fire-resistant coatings?
1、The bottom and surface coating materials are not compatible.
2、Immediately apply the anti-corrosion coating and then proceed with construction, as this will cause a chemical reaction between the coatings, which can lead to cracking of the fire-resistant coating film.
3. The pigment volume concentration (PVC) in the coating is too high.
4、The base coat paint has not fully dried before application, and the top coat paint is applied too thickly.
5. Improper treatment of the fire-resistant coating substrate results in cracks appearing on the surface where the fire-resistant coating is applied, which can also affect the substrate. Cracks in the substrate can also cause cracks in the fire-resistant coating film.
6. If the substrate for fire-resistant coating is excessively dry, it can absorb moisture from the fire-resistant coating, causing the coating to dry too quickly and develop cracking.
7. Fire-resistant coatings that are not properly mixed may result in uneven water distribution, which can lead to cracking in the applied coating film.
8、During construction, the fire-resistant coating is exposed to sunlight, causing it to dry rapidly and crack.
9. Applying a second layer of fire-resistant coating on top of a previously applied, un-dried layer results in the two layers mixing, leading to cracking in the fire-resistant coating.
10、If fire-resistant coatings are not properly maintained, exposure to strong winds and direct sunlight can cause them to dry out rapidly, leading to cracking.
Two. How to handle cracks in fire-resistant coatings.
When fire-resistant coatings applied to a structure crack, repairing the cracks is not recommended. Instead, the cracked fire-resistant coating should be cleaned and analyzed to determine the cause of the cracking. After addressing the underlying issue, the coating should be reapplied to ensure that the fire-resistant coating effectively protects the structure and maintains fire safety.