Removing dust from epoxy, especially once it's cured, can be challenging but not impossible. Start by sanding the epoxy surface with a fine-grit sandpaper (like 400-600) to remove the top layer where dust may have settled. Always wear protective gear to avoid inhaling dust. After sanding, clean the surface with a lint-free cloth dampened with either isopropyl alcohol or a mild detergent solution. This process ensures all remaining dust particles are removed. If the dust contamination is severe, it might be necessary to apply a fresh coat of epoxy over the sanded surface for a clean finish. Remember, prevention is key: work in a dust-free environment and cover the epoxy as it cures to minimize dust settling on the surface.

Fixing dyes on cotton fabric is crucial for ensuring colors remain vibrant and do not wash out. The process typically involves using a mordant, which is a substance that combines with a dye and fixes it to the fabric. One common method is to use a mixture of water and vinegar as a natural mordant, especially for plant-based dyes. The cotton fabric should be pre-washed to remove any impurities. Then, soak the fabric in the mordant solution for at least an hour. Afterward, apply the dye as per its instructions, usually involving soaking the fabric in the dye bath. Finally, rinse the fabric in cold water until the water runs clear, indicating that excess dye has been removed, and let it dry. For synthetic dyes, specific chemicals like fixatives or soda ash might be required, according to the dye manufacturer's instructions. Always wear protective gear when dealing with chemicals.

Polypropylene is a thermoplastic polymer used in a variety of applications due to its resistance to fatigue and flexible properties. It's commonly found in packaging, textiles, automotive parts, and reusable containers. Polypropylene is known for its high melting point, making it ideal for items that need to withstand high temperatures. On the other hand, acrylic is a transparent thermoplastic homopolymer known primarily for its use in sheet form as a lightweight or shatter-resistant alternative to glass. It is commonly used in signs, sales displays, roof windows, lenses, and screens. Acrylic stands out for its clarity and ability to resist UV rays and weathering, making it suitable for outdoor applications. While both materials are plastics, their properties and uses significantly differ, with polypropylene being favored for its durability and flexibility, and acrylic valued for its clarity and resistance to impact and weathering.