Every pinball machine that has ever had a flyball will have dimples. KISS will have dimples. The real question is - How can we minimize this effect ?
Improving the clearcoat product and process. 
I only have one Stern, an Elvis which is over ten years old. I haven't checked the audits to see the number of plays, but there are no dimples at all, had a good look at it at the office today. Clearly something has changed, and needs to be addressed.
It will be interesting to see where Stern goes now that we know Stern is aware of this thread.
