I know this is more of an accessories post, but I thought I might get some good advice from my fellow X-Metalites. I just recently bought the Hydrophobic Pen kit and had a couple of questions: 1) Is the coating safe if I use eyeglass cleaner after treatment? 2) After I apply the coating, I noticed it leaves an oily film after I try to buff it off with a microfiber cloth. Am I using too much or not buffing it off enough? 3) Is one coat usually good enough, or do you use multiple coats? Thanks ahead for replies!