Doors and windows are the key objects in the renovation of old houses. When dealing with doors and windows, it is necessary to determine the treatment method according to the degree of aging of doors and windows. If the wooden doors and windows are peeled and deformed, the characteristics of the wood itself change, and must be removed and redone; if the paint film on the surface of the steel doors and windows is peeled off, the main body is rusted or cracked, it must be removed and redone; if the wooden doors and windows are made of compact materials, The surface paint film is intact, and the decorative panel can be attached to the secondary construction for use; if the second-hand room door and window material is sturdy, and you also like the style, generally only a new paint can be renewed. Here are some precautions and construction points for the renovation of doors and windows.
Sandpaper grinding repair damage
If the surface of the wooden door is damaged, such as cracks or broken pits in some places, you should first put the putty on the damaged place, then sand the sandpaper, then brush the primer and topcoat.
If the base layer is not damaged, consider painting directly. The correct way to do this is to polish the original wooden door with sandpaper and then apply the primer and topcoat directly. Because the finished door is waxed on the surface, there will be grease on the surface. After polishing it, it can improve the adhesion of the paint. There is no difference in quality between refurbishment and first-time painting, so don't worry about shorter life or other quality problems.
Base material is harmless
One of the issues that everyone will pay attention to about the renovation of wooden doors is that the original use of oil-based paints or water-based paints on wooden doors will result in poor quality if they are not used in the refurbishment. Experts say that this issue is not a concern.
In general, there are three types of oil paints, polyester paint, nitrocellulose paint and alkyd paint. Alkyd paint is an earlier product that works slowly and is used less and less in decoration. The nitro paint dries quickly but the paint film is thin, it needs to be brushed many times, and the humidity is easy to whiten. Polyester paint is used relatively more, film formation is fast and the effect is better.
If you are using an oil paint, consider using the same paint or water-based paint. In general, the adhesion of the same paint will be relatively good, with the exception of polyester paint. If you originally brushed the polyester paint and then brushed the polyester paint, you need to melt the original paint film to have a good adhesion. One problem with this refurbishment is that the adhesion between the refurbished paint film and the original paint film is not so good. If the new film is damaged, such as being cut open by a sharp weapon or pulling out a pit, going along the crack or pit will cause the two layers to peel off. The water-based paint is relatively more environmentally friendly, and the wooden door renovation is mostly carried out indoors. The oily paint has a large smell and is difficult to volatilize. It is recommended that everyone use the water-based paint to renovate.
It should be noted that if the wooden door is refurbished, the first time the paint is sprayed, the better. Because the original substrate has been dried out during refurbishment, it does not affect the repainted film. If it is a wooden door that has just been bought, it is recommended not to spray it first. Because if the smell is large, it means that it does not dry out, resulting in poor adhesion of the paint film.
Dark oil is not easy to cover
Since any substrate and material can be refurbished, if the original oil is used and the color is darker, it will not be covered with a light paint unless the original color is covered with a darker color. If it is originally mixed, there is no limit on the color, and you can change it to any color.
Three points of construction attention
For the effect after film formation, the quality and construction of the paint will have a certain impact. Oily paint is generally good, normal construction can be. Usually in the construction of water-based paint, workers are prone to the following mistakes, affecting the construction effect. 1, did not follow the instructions for the correct water, the amount of water exceeds the reasonable ratio, affecting the filming effect; 2, in general, the spray brush twice primer can be applied three times, but each time need 4-6 hours to brush The second time the paint, the worker brushed the paint a second time every 1-2 hours, the paint film did not dry out, affecting the final effect; 3, during construction, the workers will use coarse sandpaper for the sake of the map, but should use fine Sandpaper, polished more delicate, the adhesion of the paint film is better.
Experts also suggest that since the wooden door renovation is mostly carried out indoors, it is better to remove the door and put it in a special room for better spraying. There is no dust to reduce environmental pollution; secondly, the front and back of the door can be seen very clearly. If it is sprayed directly on the door, it will easily generate fog when spraying, which will affect the line of sight and affect the spraying effect.
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