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A friend told me about her recent home renovations. Everything was going smoothly, but when she saw the new plasterboard ceiling, her face dropped. It had already yellowed and discolored in just a short time. She had no choice but to ask a professional to take a look, but the expert told her she had to redo the work, which was incredibly frustrating.
Brother Long has previously explained why drywall discolors after painting. I explained two main reasons to her, which only intensified her anger. First, there were issues with the puttying process. To save time, the contractor applied a second or third coat of putty before the first one had fully dried. This caused the color to bleed through, leading to discoloration. So, I told her how important it is to hire a responsible contractor. Brother Long advises everyone not to be cheap when renovating and assume that just any contractor will do the job. Haha, you'll end up crying.
On the other hand, the decorators did not apply a sealing primer before painting, and the alkalinity of the base material was too strong, causing the paint surface to turn yellow. What's even more infuriating is that I paid a lot of money, but they still used poor quality latex paint on me. It would be strange if it didn't turn yellow (this mainly applies to walls other than gypsum boards).
Besides the decorators, I explained that there are other reasons for yellowing the walls. For example, improperly rust-proofing self-tapping screws (without rust protection) can also cause yellowing in the ceiling. Water seepage from the floorboards can also cause the ceiling to become damp and yellow, so waterproofing is crucial.
Based on the actual situation of her house, the decoration workers also proposed some remedial methods. I personally prefer the first one.
The first method is to remove the original putty and rework it. This is also a permanent solution and you don’t have to worry about yellowing and discoloration.
But if you are afraid of trouble, we can also re-seal the primer on the original latex paint and then re-putty. This can also cover the discolored ceiling, but the effect is definitely not as good as the first method.
We must remember to apply anti-rust paint on the locations where there are self-tapping screws, otherwise the rust on the nail caps will also cause part of the gypsum board to turn yellow.