What makes paint sour – paint talk – professional painting contractors forum electricity in water


Mold, oxidation of volatile organic compounds, and bacteria are the most common reasons. I work with a lot of vegetable oil based products for wood finishing such as tung oil, linseed oil, and others. The oils become rancid after the can is open and then re-sealed and not used for a while. The best way to preserve your paint would be to get a can of Bloxygen or even compressed CO2. v gashi halil bytyqi Bloxygen contains argon which is a stable gas and heavier than air. You spray the heavy gas into the can and it settles to the bottom, displacing the air. It prevents mold and aerobic bacteria from growing in the can, mold requiring oxygen to grow. It prevents oxidation of volatile organic compounds. It also prevents paint from skinning over and congealing. An old painter’s trick was to exhale into the can with the lid partially on, then cap it. m gastrocnemius medialis It worked to a degree, but not as good as the two I mentioned. It’s also best to store paint in a cool location. That will inhibit bacterial growth. gas stoichiometry worksheet There’s a video or two on YouTube demonstrating Bloxygen.

Keeping a good airtight seal will help keep paint from turning "sour". Like alchemy has pointed out, excess moisture in a bucket with acrylic paint will sometimes cause it to smell like spoiled milk. Also, keeping it from temperature fluctuations lessens the chance. As the head space (the air) in a can or bucket expands and contracts with temperature changes, excess moisture is sucked into the container. This excess moisture does two things. gas out game instructions It can cause and acceleration of the CAB degradation and can also suck mold and mildew spores into the container. There are additives that control the odor but they add significantly to the cost of the paint, as many of the cheaper additives have been banned by the EPA. If i remember correctly the butyric acid odor should dissipate eventually, but and mold or mildew spores will continue to cause an odor, although a much weaker odor than the acid will cause. If you ever have a room that smells musty no matter what is tried, it is probably mold/mildew contaminated paint. Paint has to be fairly old for this to happen, but the CAB breakdown can happen pretty quickly in new paint in the proper conditions.

Tests have shown the presence of Pseudomonas & Citerobacter genus bacteria in WB paints, the contamination likely being from filtered water in the manufacture process. The bacteria reduce sulfites producing H2S which smells like rotten eggs. electricity notes physics Although the bacteria are present, I’m not so certain that sulfites are found in WB coatings or in pigments resulting in H2S production. I’d be leaning more towards the butyric acid theory vs bacterial as the cause for the smell. If I’m not mistaken, glycerin in tint also has a tendency to develop an off, sour/rancid smell. The newer -zero-VOC tints such as Gennex don’t contain glycerin. As PAC mentioned, moisture in paint cans result in CAB degradation and the expansion/contraction of air allowing moisture and mold spores in. Although the argon I mentioned doesn’t have much practical use for preserving WB coatings, it doesn’t expand as much as air due to temperature change, and doesn’t allow for mold/mildew and/or fungal growth. Argon gas in Bloxygen “might “ very well provide a solution for storage of WB finishes.