Yes, PVC cement can go bad over time. Typically, its shelf life is about two years if the can is unopened and stored properly in a cool, dry place. Once opened, air can enter the can, causing the solvents essential for creating a strong bond to evaporate, leading to the cement thickening and eventually solidifying. If the PVC cement has become thick, has solid chunks, or has a very strong, acrid smell different from its usual solvent smell, it's a sign that the cement has gone bad. It's crucial to check the cement before use, as using deteriorated cement can result in weak pipe joints, leading to leaks or failures in the plumbing system. Always check the expiration date and store the cement according to the manufacturer’s instructions to maximize its shelf life.

Yarn organization involves using the Craft Yarn Council's standard yarn weight system to establish consistency and uniformity in knitting and crocheting projects. This system includes grouping yarns into "fine" category, such as sport and baby weight yarns.

These types of yarn are typically used with needle sizes 3-5 (3.25 mm - 3.75 mm) and E-4 - 7 (3.5 mm - 4.5 mm). The recommended crochet hook size is suitable for creating lightweight garments, baby clothing, and delicate accessories. Familiarizing oneself with these yarn groups is crucial in selecting the appropriate yarn for a project and achieving the desired size in the end result.

No, you should not use PVC cement on ABS plastic. PVC (Polyvinyl Chloride) cement and ABS (Acrylonitrile Butadiene Styrene) cement are formulated differently due to the distinct chemical properties of these materials. PVC cement is designed to weld PVC pipes by dissolving the surface of the PVC, creating a chemical bond. ABS cement, on the other hand, is specifically formulated for ABS materials. Using PVC cement on ABS will not create a secure bond and can lead to joint failure. For a proper bond between ABS components, it's essential to use ABS cement. In cases where both PVC and ABS need to be joined, a special transition cement or approved mechanical coupling should be used.