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The fluorocarbon paint coating on steel structures shows signs of brush marks; that is, brush marks remain on the surface of the coating, and after it has fully dried, uneven brush strokes become visible, resulting in an uneven thickness of the coating. The main reason for this phenomenon is too high viscosity or the use of solvents with a rapid evaporation rate. In addition to this, there are other reasons as well: 1. The paint brush is too small, and its bristles are too hard, causing them to be uneven or dry and stiff. 2. The coated substrate has a very strong absorption capacity for the paint, making brushing difficult. 3. When applying paint to wooden products, the operation was not carried out in accordance with the direction of the wood grain. Methods to improve brush marks on fluorocarbon paint coatings: 1. Adjust the application viscosity of the paint to meet the requirements for application, and use the diluent provided by the manufacturer. 2. Use a softer paintbrush and apply the paint gently. After applying the paint, clean the brush with a thinner and store it properly; try to avoid using brushes with uneven bristles. 3. During application, use a sealing primer to seal the substrate, preventing moisture from penetrating it and causing the paint film to peel off; thereafter, apply the primer and topcoat. 4. When brush marks are detected, gently sand them smooth with water-sandpaper, clean off the dust with a clean piece of cloth, and then apply another coat of paint. 5. The paint used for brushing should have good leveling properties, and a thinner with an appropriate evaporation rate should be selected. The above are the reasons why brush marks tend to appear during the application of fluorocarbon anti-corrosion paint, along with the corresponding solutions. If you encounter any problems during the application process, you can consult the technical staff at any time. We will provide detailed answers regarding your supporting solutions and paint choices, along with friendly guidance and reminders.