RE: EP airboat build
first off partner the only dumb question is one not asked, lol. Coroplast is corogated plastic i think thats how you would describe it, i know you have seen the Voting signs before, the little white signs that stick in the ground on a wire frame, or if you have seen the people at the intersections while your riding in a car with those big plastic signs that say VOTE. you can find it at any hardware store, home depot, sometimes even walmart and kmart. it is usually in a 2 x 4 square but i think you can get it in rolls also, it is around an 1/8 of an inch thick and it looks just like a piece of cardboard its just made out of plastic. chances are if you walk around your neighborhood you will find one sticking in the ground advertising something. hope i didnt just confuse you bro, if you go to your local hardware store and ask if they carry coroplast im pretty sure they will, i think you can get like 4 2x4 squares for around 8 bucks.