When the wall surface is used for a long time, there will always be such a dropout or there will be a need to re-paint the wall surface. Then, what are the common senses that the constructors deal with before the wall painting ? The following small series briefly introduces the common sense of the wall painting .
1, pre-processing parts
Typical process flow: pre-degreasing → degreasing → washing I → pickling → washing II → neutralization → washing III → surface modification → phosphating → washing IV → passivation Manufacturers can make appropriate adjustments according to the actual conditions of the factory:
As a part of the pre-treatment, pickling is essential. However, in the pre-treatment process, it is better to separate the corroded parts from the non-corrosive parts, and the corroded parts are pickled, and the non-corrosive parts are preferably not pickled.
2, product pretreatment
The pre-treatment of the product involves immersing the entire product in a bath for surface treatment, which is currently used by many manufacturers. There are two kinds of manual control and automatic control between processes. More advanced is the use of PLC program automatic control, can achieve automatic transfer between processes. The general process is: degreasing → washing → surface modulation → phosphating → washing.
(a) Dealing with new rehabilitated walls: When finishing new walls generally, it does not require much quasi-work. However, if you find a small white powder on the wall, it means that the wall contains salt. After waiting for the cement walls to be dry and light-colored, the wall surface can be smoothed with sandpaper to paint. If the white powder on the surface of the cement is too much, it will precipitate. After cleaning, apply a primer to prevent salt from eroding the wall in the future.
(b) Dealing with painted walls: Please wipe them with a sponge or a rag, clean the ceiling first, and clean the surrounding walls. If you wipe with water, remember to wait until the surface is completely dry before painting. If the original old paint surface is smooth, it must be slightly rubbed with sandpaper to enhance the adhesion of the new paint film.
(1) Remove the peeling paint film: Remove the peeling paint film with a spatula or iron brush, and then use sandpaper to grind the surface.
(2) Demolition of Paste Wallpaper: Be sure to remove the old wallpaper. Mix the detergent with hot water, soak the old wallpaper thoroughly. Then scrape the surface with a scraper and clean the residual glue on the wall with water. Wait until it is dry. Smooth.
(3) Trimming the surface: Fill the cracks in the pits with a batch of soil cutters. After it is completely dried, sand it again with a sandpaper pad.
The related information about the pre-painting treatment was introduced here for everyone. I hope this article will help you. If you still have anything you don’t understand, you can follow our website and we’ll get back to you as soon as possible.
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