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You got me thinking about Formex, it seems to be an extruded polypropylene, so it has really good properties for the job, not as rigid as glass boards, but no itchy hands from cutting it. Did you get GK-62? or something thinner? Fish-paper is still available, if that is your thing. Where are you getting small quantities of Formex? I can't find anyone willing to sell single sheet or smaller amounts of anything but GK-17.
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