i use the coroplast board. I get it from a sign company it cost $20 per 4'x8' sheet i cut it in 4"x6" for under 1/2 yrd and 8"x12" for pieces over 1/2yrd to 2 or 3 yrds. i use plastic paper clips from walmart 100 for $1.88 to clip on the fabric to keep it from coming undone here is a pic
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