You try it then post back with the results.
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I've also thought about spraying on polyurethane. Polyurethane probably has a similar index of refraction as the polycarbonate discs, and as it dries, the surface tension will probably cause it to fill in minor scratches and dry with a relatively smooth surface, which can be buffed or polished with fine steel wool, if necessary. Any thoughts on this ?
I was just curious to see if this off the cuff tip about lip balm actually worked. I did apply some to a previously unlistenable track and while it didn't fill in the entire scratch it is much better now. I noticed the first ingredient in the lip balm was microcrystalline so I applied some Renaissance microcrystalline wax/ polish and it improved it some more but didn't eliminate it altogether, It does look like a pretty deep scratch though.
I suspect this remedy will work fairly well on minor scratches and plan on experimenting further