Dairy Products. Milk doesn't contain yeast, but some other dairy products are made by fermentation, which means that they may contain yeast. If you're trying to avoid yeast, don't eat yogurt, kefir, buttermilk or cheese. Butter, cream and ice cream, however, are not likely to contain yeast.airy Products. Milk doesn't contain yeast, but some other dairy products are made by fermentation, which means that they may contain yeast. If you're trying to avoid yeast, don't eat yogurt, kefir, buttermilk or cheese. Butter, cream and ice cream, however, are not likely to contain yeast.
Flex SealÂ® is now available in White, Brown, Almond, Silver, Green, Blue, Red, Terra-Cotta, and Yellow!
Pros. 1  Effective sealant that will last for many many years. 2  Easy to use (just spray on a leak or crack) 3  High and low temperature resistant.  The sealant is 1  waterproof. Can be used on aluminum, steel, pottery, glass, plastic and many other surfaces.  Once the flex seal layer is completely dried you can paint it.