To apply a new waterproofing membrane on top of an old bitumen waterproofing membrane, the surface of the old membrane should be thoroughly cleaned and prepared. Any loose debris, dirt, or old adhesive should be removed to ensure proper adhesion of the new membrane. Once the surface is clean, a primer should be applied to promote adhesion between the old and new membranes. Finally, the new waterproofing membrane can be installed according to the manufacturer's instructions, ensuring that it is properly sealed and bonded to the old membrane to provide effective waterproofing. **

A utility knife or a sharp blade is typically used to cut the waterproofing membrane. It is important to use a sharp tool to ensure clean and precise cuts, which will help in achieving a proper seal and prevent water leakage. Care should be taken to avoid damaging the underlying surface while cutting the membrane. **

Ideally, the waterproofing membrane should be applied in dry weather to ensure proper adhesion and effectiveness. If the membrane is applied and then it rains before it has fully cured, it can compromise its ability to create a watertight seal. Water exposure during the curing process can lead to delamination, reduced adhesion, and potential leaks. Therefore, it is best to apply the waterproofing membrane when there is no rain in the forecast and allow it to fully cure before any water exposure. **

Fimo is actually a brand of polymer clay, so the main difference is that Fimo is a specific type of polymer clay. Polymer clay is a type of modeling clay that hardens when baked in an oven, and it is made of PVC particles mixed with a plasticizer and color pigments. Fimo, on the other hand, is a specific brand of polymer clay that is known for its high quality and vibrant colors. While there are other brands of polymer clay available, Fimo is often preferred by artists and crafters for its consistency and durability. **

The term "biomembrane" is a broad term that refers to any membrane found in living organisms, including cell membranes. The cell membrane, also known as the plasma membrane, is a specific type of biomembrane that surrounds the cell and separates its internal environment from the external environment. A double membrane refers to a structure that consists of two layers of membrane, such as the nuclear envelope or the mitochondria. The double membrane provides additional protection and compartmentalization for the organelles it surrounds. **

Powder coating is a dry finishing process where a fine powder is applied to a surface and then heated to form a hard finish. It is typically used on metals, such as aluminum or steel. On the other hand, PVD (Physical Vapor Deposition) coating is a process where a thin film is deposited onto a surface through a vacuum coating process. PVD coatings are typically used to improve the hardness, wear resistance, and corrosion resistance of a material, and are commonly used on tools, watches, and automotive parts. **

A selective membrane is a type of membrane that allows only certain substances to pass through while blocking others based on their size, charge, or other properties. On the other hand, a permeable membrane allows all substances to pass through, regardless of their properties. Selective membranes are commonly used in processes like filtration and dialysis to separate specific components, while permeable membranes are more general in their permeability. **

A permeable membrane allows all substances to pass through it, while a semipermeable membrane only allows certain substances to pass through. Semipermeable membranes are selectively permeable, meaning they only allow specific molecules or ions to pass through based on their size, charge, or other properties. Permeable membranes, on the other hand, do not discriminate and allow all substances to pass through. **