Quoted from vid1900:
This is where you start to separate the boys from the men in playfield restoration.
Even sanding the edge of the insert is not enough.
The final step is to prime the plastic with 3M Plastic Primer.
It goes on thin like water and dries in a few seconds.
Now when you apply the epoxy, you can't chip it off.
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I did some looking into where I would get this primer and 3M Plastic Primer P591 Black is all I could find in the relm of plastic primers. Could you tell us where you would go to replace what you currently have. Thanks,Charlie