I have been using this method since 2017 the idea here is that the ultra violet glue and tempered glass screen protector will create a strong bond that not only covers imperfections, but as well as deep scratchers
 This message is not practical for it just anyone however, if you know how local ultraviolet glue works, and you are familiar with screen protectors, you will be able to accomplish this.
 The items I used can be found on eBay or Amazon. If you need me too please links I can do that as well. I hope this helps someone.