The application process of fluorocarbon paint varies depending on the type of spray material used. This guide outlines the proper method for applying fluorocarbon coatings to exterior walls, ensuring a durable and high-quality finish.
Base Layer Requirements
1. The base layer of plastering and concrete must meet the standards outlined in the "JGJ Building Decoration Engineering Construction and Acceptance Specifications."
2. The surface should be free from dirt, including areas like joints, window frames, and other corners.
3. The base surface needs to be solid, without cracks, peeling, or looseness. The flatness should not exceed 2mm, and there should be no dust or foreign particles on the surface.
4. For exterior wall coatings, the moisture content should not exceed 10%, and the pH level should be below 9. New cement plaster walls should cure for at least 10 days in summer and 20 days in winter, while cast-in-place concrete walls need 21 days in summer and 28 days in winter before painting.
Surface Preparation
1. Check the wall’s flatness. High spots should be sanded down, and deep holes or depressions should be filled with cement mortar and smoothed out.
2. Large cracks should be cut and filled with high-elastic putty in multiple layers until the surface is even. Once dry, smooth it with a trowel.
3. Use a brush, knife, or sandpaper to remove any debris or loose cement from the wall surface.
4. Ensure the wall meets the flatness requirement of ≤2mm.
5. The surface should be clean, free of dust and any sticking particles.
Fluorocarbon Paint Anti-Cracking Putty Application
1. Use specialized anti-cracking putty designed specifically for fluorocarbon paint.
Chlorofluoroethylene-Vinyl Acetate Type Formulation
1. Mix the putty with water in a ratio of 20:1:8. Make sure it is fully stirred using a hand drill.
2. The maximum standing time is 4 hours. Do not use if it has been left longer than that, as cured slurry is not suitable. Clean any contaminants on the wall before application.
3. Apply the putty using a 2-meter aluminum ruler. Scrape once, then again, keeping the pressure and speed consistent to avoid wave-like patterns that can affect flatness.
Tetrafluoroethylene-Vinyl Ether Type Formulation
4. Apply decorative tape as needed to mark boundaries. Spread the putty along the tape lines and carefully remove the tape after each section.
5. Apply the putty in 4–5 layers. Allow it to dry (usually within 4 hours) before sanding.
6. If the putty is too hard, it will be difficult to sand, leading to wasted labor and materials. A rough or greasy surface must be thoroughly polished to prevent excessive putty usage later.
7. Sand using 120 or 150 mesh sandpaper.
8. After sanding, ensure all uneven areas are removed, and straight edges and cornices are properly aligned.
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