How did you join the pieces of coroplast? I made a tail box for my recumbent bike from coroplast and learned that I could not glue it. I used nylon wire ties and covered it all with white plastic tape.
My first piece of coroplast was an election sign that I liberated from a fence on the evening after the election. Saved the candidate the trouble of taking it down
Happy cycling and teardropping
<Chas>
![Beer :beer:](./images/smilies/beer.gif)