Everything that touches your clear coat has the ability to scratch it. The softest towels can be "pushed" to scratch. I used to give towels the "cd" test and I never found one that couldn't scratch. Hell, I've even seen the ridges of my fingerprints scratch clear coat. I try to minimize contact all time and do a light- medium polish every few years. That has worked for me for many years.
I did Opti-coat my car when I bought it back in 2012. It really is a neat product.
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