The scraping method: Utilizing metal or non-metallic scrapers, such as hard rubber sheets, fiberglass scrapers, and horn scrapers, manually apply coatings for various thick paste-type fire-resistant coatings and putties.
　　
Roll Coating Method: The roller is a small-diameter hollow cylinder, with a surface coated in long, fluffy synthetic fiber bristles. The cylinder is fitted with two washers at each end, which are pierced and through which a curved handle passes. During use, the roller is first dipped into the paint to saturate it, then pressed firmly to apply it to the desired surface. Currently, roller coating systems that utilize compressed air to deliver the paint are being developed.Fire-resistant coating for steel structures

Brush Painting Method: The brush painting method is suitable for applying coatings to objects of any shape, with the vast majority of fire-resistant coatings being applicable using this technique. It easily penetrates the fine pores of metal surfaces, thereby enhancing the adhesion to the metal. However, it has drawbacks such as low production efficiency, high labor intensity, and sometimes brush marks on the coating surface, which may affect the decorative appearance of the coating.
　　

The spray method involves using compressed air and a spray gun to atomize paint. Its characteristics include a uniformly even coating quality and high production efficiency. The缺点 is that some of the paint is wasted, and due to the large evaporation of solvents, it can affect the operator's health. The key equipment for air spraying is the spray gun, which typically comes in three types based on paint supply: gravity, suction, and pressure feed, and is further divided into small and large sizes depending on the spraying capacity. For high-viscosity paints, a higher air pressure is required, so a large-bore nozzle should be selected; for low-viscosity paints, less pressure is needed, and a small-bore nozzle can be used. The air pressure for air spraying is generally 0.3~0.6 MPa.

This article is about fire-resistant coatings for steel structures.