iPhone 6s oleophobic coating screen

I looked online if there is not any solution to cover up the minor scratch on the corner left hand edge of the screen. Unfortunately, they do sell the product that covers up the minor scratch of the oleophobic coating glass of the iPhone and they do not sell it in the United States. I watched YouTube video clips of how they changed the screen of the iPhone. I felt it is very dangerous to do that especially their process will damage the LCD screen and the front of the phone itself. I know these people do not want to pay $129+ have a Genius Bar or an Apple Store technician to change the oleophobic coating glass part of the iPhone screen, but ripping the glass and the oleophobic coating of the iPhone is more dangerous and complicated to do this on our own.

Since Apple Technician told me that they do not cover cosmetic wear only accidental damage. So therefore, I tried Vaseline to cover up the minor scratch since it is not a deep scratch on the screen. Vaseline covered it up very well, but it does not stay on there very long. I never experimented Vaseline on an iPhone with a fingernail scratch that is very deep. I do not want to try other solutions that could damage the oleophobic coating and the glass itself. Since my phone is refurbished and it looked like someone previously used the iPhone and sold it to someone on eBay with minor paint scratch, I do not want to risk in going to the Apple Store to have it checked if they will fix the minor scratch on the corner left hand edge of the screen. It is just for a minor fingernail scratch so it is not necessary for me to go over there make an appointment to have it checked or spend $129.00 just for a minor fingernail to get it replaced. If my iPhone has an accidental damage and the oleophobic glass shatters, I would pay $129.00 to get it replaced.