Three Trees was a company that specialized in the development of waterproof coating. They had recently launched a green, odorless vegetable oil-based waterproof coating, which was made from a variety of sources such as vegetable oil and recycled animal oil. It had a lower concentration of volatile organic compounds and a lower odor. This waterproof coating had the characteristics of high strength, large extension rate, water resistance, acid resistance, and so on. It was suitable for indoor and underground waterproof projects, parking garages, subways, and other places. Sanshu's waterproof coating had also obtained the drinking water level certification and achieved innovative results in scientific and technological progress. Their products were featured by environmental protection, health, and freshness, leading the trend of " changing oil to water " in the waterproof coating industry.
To protect CGC graded comics from UV, keep them away from direct sunlight and use special storage containers with UV protection. Also, avoid exposing them to fluorescent lights for long periods. This helps preserve their quality and value.
One horror story could be that the sundek concrete coating started peeling off shortly after application. Maybe it was due to improper surface preparation, like not cleaning the concrete well enough before coating. This led to an unsightly look and a waste of money on the coating.
One common theme could be power - up. The idea of coating invisible armor haki might be used as a way for the character to gain an edge in battles, so power - up scenarios are likely. Another theme could be secrecy or stealth. Since it's invisible, it might be used for sneaky maneuvers or surprise attacks in the fanfic.
It could be inspired by the desire to combine two popular fictional elements. Naruto's world of ninjas and the concept of Haki from One Piece. Writers might want to see how Naruto's skills would be enhanced with the addition of Haki on his swords.
To write a good fanfic about it, you need to focus on world - building. If the sword has invisible haki coating, what does that mean for the world it exists in? Are there others with similar powers? Also, build tension in the story. Maybe the sword's power is fading and the protagonist has to find a way to restore it. And don't forget about character development. Let the wielder of the sword grow and change as they learn more about the power of the haki coating.