The solution to putty powder turning yellow! What if the wall paint changes color?

In the decoration, the quality of the material selected is not up to standard or improper construction will appear a variety of problems, such as putty powder, yellowing, in fact, it can be said that almost all home. So what's causing it, and how do you fix it?
when the putty construction is finished and dry, gently film with your hands under the wall, you will find that your hands are white, this is the drop powder.
reasons: putty powder after the surface has been dried after polishing will drop powder, the product after shelf life or improper storage, adhesion will decline, putty powder drying may be high grass-roots water absorption rate, resulting in not enough moisture for curing
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Solution: master the polishing time, its best time is putty surface watermark disappeared immediately after polishing;
the "yellowing" putty is finished, there will be a partial or total yellowing phenomenon over time.
Reasons: When working with paint or film remover at the same time will cause the putty film to turn yellow, the grass has oil or other grease stains, not cleaned up will also lead to putty film yellowing, when the putty is contaminated with rust or other colored substances will also make the putty film yellow.
solution: avoid not working with paint or film disfilming agent, clean the grass before scraping putty, avoid oil pollution, the construction temperature of this project should not be less than 5 degrees C, after completion, care should be taken to protect against pollution.
the "de-layering" putty layer construction is completed for a period of time, there will be putty layer shedding phenomenon.
reasons: the substrate contains a large amount of waste oil or wax emulsion and other defilm agents;
Solution: remove the shedding layer, scrape putty again, for the construction wall of severe powdering, should be sealed first, and so dry, and then carry out the construction of putty layer, in the construction process or 8 hours after construction, it is best to ensure that putty is not soaked in water.
the paint on the wall has changed color?
the cause of the paint's color change and loss of
the paint was not on the primer. Some people feel that the quality of the paint is good and do not need to be primer, this is a false perception! No matter how good the quality of the finish, the primer is a must. Its main role is to improve the adsorption of the paint, increase the fullness of the paint, and also provide anti-corrosion function. Can ensure that the paint is absorbed evenly, so that the paint to give full play to the decorative effect.
paint the primer without drying it. Some people talk about wet touch wet process, primer is not dry, can be directly painted. This statement is not feasible! Wet touch wet process is mainly about polyester and polyurethane and other two-part cured paint, generally is the primer after the first brush, the surface does not touch the hand of the case of brushing the second primer, the same reason, the first time the paint brush the surface without the hand can brush the second time.
the grass of the wall is not handled cleanly. If the wall base is not clean, such as the old paint is not polished clean, or will affect the gloss of the wall paint.
last point is the weather factor I've talked about before. In the low temperature, paint is very easy to change color, basically the paint film dry color change.
don't know where the fan bought the house, but the wall paint color change is probably the reason for these. Let's look at the solution.
can I avoid changing the color of the wall paint?
1, if the weather is too cold, but also anxious to paint, you can use a heater to increase the temperature of the room.
2, be sure to remember to put on the primer! In the case of this fan, the problem has been brushed, which can only be reworked, with dry and wet sandpaper to grind off the old paint before re-painting.
3, choose the right time, the weather cooling should be suspended construction, it is impossible to avoid the option to add fast drying agent.
can I remedy a change of color if I have already brushed it?
has been brushed out and the problem can only be reworked. If you're having trouble reworking, try covering it with wallpaper, or decorate it with other decorative painters, as long as you don't mind. Rework to shovel the original wall skin and re-scrap the putty with latex paint.