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I know the faces of the coroplast are corona treated but the cut ends arent. Flashing with a flame i would thing would be hit or miss. I do have a bottle of primer somewhere but I wonder if i could do a diy corona treatment on the ends.
I have a 15kV 30mA 60hz neon sign transformer based jacobs ladder in my basement. Maybe I could run the edges of the coroplast over the arc to treat them. I could put much shorter electrodes on it and build a simple box around it with an open top and a tall slot cut in it to pass the coroplast through. Hehe.
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