The addendum led me to believe this was a heat resistant solder on mat. If so, it would have been great. What it actually is is a piece of homesite board and yes heat resistant we use them in stained glass. You can buy a 4Γ8 piece at Menards for $22.00. That's what I do. But I was under the impression it was a solder mat. $13.00 for 12x12 big lesson learned
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