Update
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Wednesday 21 March 2018 at 19:00
The Hardtop is .030" thick and it's pretty rigid. (You'll receive it flat, not rolled up. Or, at least I did.)
The thickness of the paint is not an issue. Flat, level inserts are much more important.
Source: http://pinside.com/pinball/forum/topic/hardtop-playfield-new-product-announcement-poll-included/page/18#post-4292702