If your paint smells sour, rotten, or like vomit, it has almost certainly "gone bad". This happens when bacteria, mold, or mildew contaminate the water-based (latex) paint, causing the organic compounds to decay.
The smell comes as a combined result of the fresh paint not only reacting with the bacteria but also sealing it in behind the new coat and the microbes continue to give off an unpleasant whiff from beneath that new coat. This problem is not brand-specific; it has been known to happen with a wide range of paints.
Although opened paint can last up to around two years (if stored properly), you can usually tell if it has spoiled by looking at the expiration date. If however, it gives off a foul, rancid smell you should probably get rid of it (see further down to dispose of stale paint responsibly).
Symptoms
To speed up paint off-gassing, maximize the evaporation of chemicals by combining high airflow, warmer room temperatures (around 70°F to 80°F), and low humidity. Use portable fans to pull fumes outside, run a dehumidifier, and place odor absorbers like activated charcoal or baking soda around the room.
In general, VOC levels are highest in the first 48 hours after painting and gradually decrease over time. However, some VOCs can continue to off-gas for up to six months after the paint is applied.
To get paint fumes out of your lungs, immediately move to fresh air and breathe deeply. Lungs are self-cleaning organs that process and expel volatile organic compounds (VOCs) naturally once exposure stops. To aid recovery and clear your airways, follow these steps:
For mild to moderate paint fume sickness, symptoms like headaches, dizziness, and nausea typically resolve within a few hours to a few days after leaving the area. The duration depends on the paint type and exposure length.
Paint fumes especially from solvent-based or isocyanate paints can pose serious health risks. Vapours and fine mist released during spray painting may cause headaches, dizziness, skin or eye irritation, and even long-term issues such as occupational asthma.
It is not recommended to sleep in a room you just painted until it has completely dried and the air has cleared. The "fresh paint smell" is caused by Volatile Organic Compounds (VOCs), which can cause headaches, dizziness, and throat irritation.
Toxic or harmful mold (such as Stachybotrys chartarum) typically smells strongly musty, earthy, or like decaying vegetation and rotting wood. This smell comes from Microbial Volatile Organic Compounds (MVOCs) released as the mold grows.
Paint off-gasses volatile organic compounds (VOCs) the heaviest in the first 24 to 72 hours. However, trace off-gassing can continue at lower levels for several weeks to months while the paint completely cures.
The characteristic "old age smell" is scientifically known as nonenal (or 2-nonenal). It is a chemical compound produced when the skin's natural oils and fatty acids break down and oxidize as we age.
Even though fumes from latex and oil paints can irritate the eyes, nose and throat, they do not poison the body when used as directed. Any irritation should go away once you get into fresh air. If fresh air doesn't help, take a warm shower and wash your hair.
To determine if your old paint is still usable, check for a sour or rotten smell, severe separation that won't blend smooth, and a chunky or lumpy texture. If the paint has ever frozen solid or contains mold, it is permanently ruined.
This odor has been associated with various chemicals (such as butyric acid or carboxylic acid, plastic and vinyl products and even flowers and food products). One frequent cause of this odor is the use of old dirty water containing cleaning solutions on floors, walls and other surfaces which in drying emit this odor.
Yes, paint fumes can cause flu-like symptoms. Inhaling volatile organic compounds (VOCs) or chemicals from solvents—especially in poorly ventilated areas—frequently triggers physical reactions that mirror an illness.
Paint fumes can be harmful, primarily because they release Volatile Organic Compounds (VOCs) as they dry. While short-term exposure typically causes temporary symptoms like headaches or dizziness, prolonged exposure to high concentrations can lead to organ or nervous system damage. Pregnant women, children, and those with respiratory issues are particularly vulnerable.
In general, you should wait at least 1-3 days before sleeping in a freshly painted room. This allows the paint to fully dry and VOCs to dissipate. However, the exact time may vary based on the factors mentioned above. If you still notice a lingering paint smell, it's best to wait longer.
Yes, inhaling paint fumes can be harmful to health, as they often contain volatile organic compounds (VOCs) and other toxic substances. Short-term exposure to these fumes can cause headaches, dizziness, and irritation of the eyes, nose, and throat.
Open windows, doors and keep a constant airflow circulating within the room. Place a couple of rotating fans around the room, angled towards an open window, and they'll help get rid of the fumes. Don't switch the fans on until you've finished your coat of paint and it's touch dry.
For a newly painted room, ventilate the space by opening windows and running fans for at least 24 hours before sleeping there. Water-based (latex) paints off-gas quickly and are safe after a few hours, while oil-based paints require 48 to 72 hours of airing out.
There is no way to fix or regrow damaged lung tissue. The goal of treatment is to stop further exposure, prevent worsening of the disease, manage symptoms, and help you stay active and healthy.
Early lung damage often develops gradually and can easily be mistaken for aging or being out of shape. The most common indicators include persistent shortness of breath, a chronic cough, frequent respiratory infections, and unexplained fatigue.
7 Tips to Help Your Body Detox From Air Pollution Exposure