One, Reasons for paint peeling
1、The adhesion of the water-based paint film has decreased due to the presence of dust and debris within the film that have not been properly cleaned, resulting in significant peeling.
2、The primer and topcoat do not fuse or adhere to each other.
3. Contains oil stains and rust that have not been cleaned.
4、Excessive use of hardeners, improper mixing of the base materials, and the combination of nitro and polyester paints on the same substrate can also lead to severe peeling.
Two. How to handle paint peeling on water-based paints.
1、Localized repair method
If the cracking or detachment is limited to a specific area, simply removing and reapplying the topcoat is sufficient. If possible, it is recommended to apply a layer of ready-mixed putty paste as a base before applying the topcoat for better results. However, if the detachment is extensive, it indicates a more serious problem and requires extensive repair.
2、Comprehensive Repair Method
This situation applies to large areas of water-based paint detachment. Generally, if the detachment is caused by water penetration, the underlying cause must be identified and addressed before repair, especially ensuring proper waterproofing. Otherwise, even if the surface is repaired, the problem will persist.
Three. How to prevent water-based paint from detaching
1. First, thoroughly sand the underlying layer to achieve a smooth surface. Ensure that the sides are sanded evenly under adequate lighting.
2、Apply a primer coat. If using waterproof putty paste, use a primer that is resistant to alkali.
3、Can be applied with two coats of exterior paint.
4、Apply a clear coat to enhance the color vibrancy of the topcoat.