Quoted from leckmeck:Clear as mud!
There was a factory topcoat applied over the artwork originally.
If you clean the playfield with alcohol and ME, you will remove this factory topcoat.
At that point, the ball will be wearing directly against the paint itself.
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Now should you decide to put an automotive clear coat over the cleaned paint surface, you may want to choose a less glossy final buffing.
Or you can buff it out to full mirror, and at a latter date, knock the finish back to a duller sheen with Rottenstone.
The choice is yours. The cleared playfield can be buffed or de-glossed at any time in the future.