Solder does not stick to the wire because the wire's surface may be oxidized, dirty, or coated with a non-metallic substance, which prevents the solder from forming a strong bond. In order for solder to stick to the wire, the surface needs to be clean and free from any contaminants. This can be achieved by using a wire brush or sandpaper to remove any oxidation or dirt before soldering. Additionally, using a flux can help to remove any oxidation and improve the solder's ability to adhere to the wire. **

For electronic keyboards, it is best to use rosin-core solder wire. This type of solder wire contains a flux core that helps to clean and prepare the surfaces being soldered, which is important for electronic components. The rosin-core solder wire is also easier to work with and provides a strong, reliable connection for the delicate components found in electronic keyboards. **

To seal pipe joints waterproof, you can use a variety of methods such as using Teflon tape or pipe joint compound. Teflon tape is wrapped around the threads of the pipe before connecting the joints to create a tight seal. Pipe joint compound, also known as pipe dope, is applied to the threads of the pipe before connecting the joints to prevent leaks. Additionally, using rubber gaskets or O-rings can also help create a waterproof seal at pipe joints. **

To seal pipe joints waterproof, one can use a waterproof sealant or adhesive specifically designed for plumbing applications. Before applying the sealant, it is important to clean and dry the pipe joints thoroughly to ensure a proper bond. Apply the sealant generously around the joint and allow it to cure according to the manufacturer's instructions. Additionally, using waterproof tape or wrapping the joint with waterproof tape can provide an extra layer of protection against leaks. **

When soldering gold wire, especially 585 rose gold, it is necessary to use a solder that matches the karat of the gold. For 585 rose gold, which is 14 karat gold, you should use a 14 karat gold solder. This will ensure that the color and properties of the solder match the gold wire, creating a seamless and durable bond. Using a lower karat solder can result in discoloration and a weaker joint. **

To seal an old wet cell waterproof, you can start by ensuring the cell is completely dry before attempting to seal it. Once dry, you can use a waterproof sealant or coating to cover the cell and create a waterproof barrier. Make sure to apply the sealant evenly and allow it to fully cure before exposing the cell to any moisture. Additionally, you may want to consider using a waterproofing tape or adhesive to reinforce the sealant for added protection. **

Soldering stranded wire is generally considered the best option as it provides a strong and reliable connection. Crimp connectors can also provide a secure connection when done properly, but they may be more prone to failure if not crimped correctly. Solder connectors can provide a strong connection, but they can be more time-consuming and may be more prone to failure if not soldered properly. Overall, soldering stranded wire is often the preferred method for creating a secure and reliable electrical connection. **

It is generally recommended to solder a high-low adapter rather than using wire taps. Soldering provides a more secure and reliable connection, ensuring better conductivity and reducing the risk of signal loss or interference. Wire taps can be less reliable and may lead to potential issues with the connection over time. Soldering also provides a cleaner and more professional finish to the installation. **