It is coroplast (like the sign making board realtors use). In that post http://www.quiltingboard.com/t-43871-1.htm she describes where to get it, how to cut it, etc. Only downside is there are 27 pages to that post.Originally Posted by btiny36
I use comic book boards. They're a different size, yet still acid free. And much, much cheaper. And still looks nice:




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