What’s important to know here is that these products don’t have a permanent shelf-time. Over time, the active ingredients turn and the results won’t be as fascinating. Usually, it takes a year or so for a product to start losing its power, so it’s best to use it before that time. Naturally, the precise time depends on the product, so consulting the label once again beats general knowledge. If you have some significant amount of the product left, it’s generally best to keep it in the original package. The good preservation starts at the beginning- the opening of the product. Use care not to damage or dent the lids and covers, because they might not fit well, and not be as air-tight. If the product is in a can, use specific can opening tools and accessories. A good idea is to store these products well-closed upside-down since that would block extra air from reaching the resin. The last thing is to keep in mind that temperatures above 100°F (38°C) rapidly lose their specifications. Sunlight or any source of strong direct light also affects them. Moisture also damages some of the products in the long run. For alternative storage solutions, it’s best to consult with the manufacturer, because there are options for some of the products, like glass or FIFO bottles, but this does not apply to every product. The point is to avoid the packaging materials that would mix with the active ingredients in the polyurethane. If the product remains on the shelf for a while, some dry matter could fall to the bottom and form a layer on the surface. Don’t worry, this is normal, it just needs a stir to mix the liquid and try parts again evenly. When using the product, it’s good to put it into another container, as much as you need, and keep the rest sealed as soon as possible. If the product has a strong odor, it’s probably turned and shouldn’t be used. This can happen if bacteria or other contaminant is introduced that drastically alter the chemistry of the substance, making it unusable. This is why sealing it as tightly as possible is very important. Finally, pay attention to some products because some of them don’t like shaking. Or better, we won’t like the bubbles in this product, because it will affect the adhesion during the application, and it will increase the forming of bumps. Let the product settle for a while (sealed) until the bubbles disappear.