Fountain pen ink is generally durable for several years if stored properly. When kept in a cool, dark place and away from direct sunlight, the ink can last for a long time without losing its quality. However, if the ink is exposed to extreme temperatures or sunlight, it may degrade more quickly. It's important to use the ink within a reasonable timeframe to ensure the best writing experience. **

The durability of a paint correction pen can vary depending on the brand and quality of the product. Generally, a high-quality paint correction pen can last for several uses, covering multiple small scratches or imperfections. However, the durability can also depend on how frequently and extensively the pen is used. With proper care and storage, a paint correction pen can remain effective for a reasonable amount of time. **

Yes, the S Pen of the Note 20 Ultra is waterproof. It has an IP68 rating, which means it can withstand being submerged in water up to 1.5 meters deep for 30 minutes. This feature allows users to use the S Pen even in wet conditions without worrying about damage. **

It ultimately depends on personal preference and the specific use case. Fountain pens are known for their smooth writing and elegant appearance, but they require more maintenance. Pencils are great for sketching and can be easily erased, while ballpoint pens are reliable and convenient for everyday use. Each writing instrument has its own unique qualities, so the best choice depends on individual needs and preferences. **

In 9th grade, it is common for students to use a regular pen for their schoolwork. Fountain pens are often seen as a more sophisticated writing tool and may not be necessary for everyday use in a school setting. However, if a student has a particular interest in calligraphy or enjoys using fountain pens, they may choose to use one in 9th grade. Ultimately, the choice between a pen or fountain pen in 9th grade comes down to personal preference and comfort. **

The choice between a fountain pen and a ballpoint pen ultimately comes down to personal preference and the specific writing needs of the individual. Fountain pens are often favored for their smooth writing experience and the ability to create varied line widths, making them popular among those who enjoy calligraphy or expressive writing. On the other hand, ballpoint pens are known for their convenience, reliability, and ability to write on a variety of surfaces, making them a practical choice for everyday use. Ultimately, the "better" pen depends on the user's writing style, preferences, and intended use. **

To remove waterproof film pen from a silicone case, you can try using rubbing alcohol or nail polish remover on a cotton ball or cloth to gently rub the stained area. Another method is to create a paste using baking soda and water, apply it to the stained area, and scrub gently with a soft brush. If these methods do not work, you can also try using a magic eraser or a silicone stain remover specifically designed for removing tough stains from silicone surfaces. **

Ballpoint pen refills are replacement ink cartridges for ballpoint pens. They are designed to be easily inserted into the pen to replenish the ink supply once it runs out. Fountain pen ink, on the other hand, is a liquid ink used in fountain pens. It typically comes in bottles and is used to fill the ink reservoir of the pen. Fountain pen ink is available in a wide variety of colors and formulations, and is often favored by those who enjoy the unique writing experience and customization options that come with using a fountain pen. **