Polypropylene, a thermoplastic polymer, is known for its resistance to shrinking and stretching. This feature makes polypropylene garments durable and resistant to wrinkles, but it also means they are challenging to shrink intentionally. If you're looking to resize a polypropylene shirt, direct heating methods like boiling or hot washing, commonly used for shrinking natural fibers, are not recommended as they could damage the fabric or have no effect at all. Instead, consider sewing alterations or the use of hot air from a hair dryer or heat gun for targeted areas, understanding that significant shrinkage might still be unachievable. If you're not experienced with sewing or cautious use of heat tools, consulting a professional tailor for alterations might be the best approach to ensure the desired fit without risking damage to the shirt.

When choosing PVC for air lines, it is critical to use the type specifically designed for compressed air. Standard PVC pipe is not recommended due to the risk of shattering under pressure, posing safety hazards. Ideally, one should opt for Type 1, Schedule 40 or Schedule 80 PVC, which are thicker and more durable, thus better suited for handling the pressure needs of air lines. Furthermore, it's essential to ensure the PVC has a pressure rating that exceeds the system's maximum pressure to prevent failures. Additionally, always adhere to local codes and regulations regarding PVC use in compressed air systems, as some areas restrict or prohibit its use due to the potential danger of bursting pipes.

Cellulose sanding sealer is a popular choice among woodworkers due to its rapid drying characteristics and ability to seal the wood's pores efficiently. Made from cellulose fibers, a natural compound found in plant cell walls, it provides a robust and clear base, which is ideal for preparing the wood surface for subsequent layers of finish. By sealing the grain, it helps to prevent uneven absorption of stains or finishes, ensuring a smooth, even coat. Additionally, because it sands easily, it allows for the removal of any grain raise or minor imperfections, resulting in a superior final finish. Its fast-drying advantage facilitates quicker project completion, making it a preferred option for both professional craftsmen and DIY enthusiasts. However, it’s important to work in a well-ventilated area, as the solvents in the sealer can be potent.