I solved AR coating issue savage

kursat

after I forgot my 2225.80.00 Seamaster Chronograph under the sun for some hours I saw some marks on the sapphire glass. I didn’t know it was coated so I tought it was water marks so I went to the Omega service and they charged me approximately 200 usd for the glass. I said thats fine but then they told me I had to pay additional 300 usd to assemble it. I live in Turkey by the way. It’s too much for the glass so I wanted to think for a while. Then I saw 30.5 x 3 mm sapphire glass for 25 usd on Aliexpress. I found out it is ar coating issue so I ordered uncoated sapphire. Since I ordered a new one I could do whatever I want on this glass so I took it out and tried nitric acid, didn’t work. Tried acetone, it slightly reduced. Then I tought this is a sapphire glass. It is difficult to scratch it so I used my waterproof sand papers on it. I used 600-1000-1200-2500 and 3000. I took the coat off and it’s crystal clear now. There is no scratched.