Thanks. I'm hoping to get a quote tomorrow from a local dealer. Home Depot sells it (for orders, no local stock) but the largest dimension is 4x8 sheets. The dealer has dimensions as large as 60x120. If I can find a local RV supply house they may have it on a roll and sell it by the foot.
Minor update. The local Coroplast dealer didn't have any sizes larger than 4x8 and required a $100 minimum. No thanks. I'll get some from Home Depot. Loctite 406 ordered for gluing the Coroplast together. After all that I had the idea of using the plastic wrap used to winterize boats. It shrinks when heated. I don't know if it would actually work on my insulated fresh water tank but it might be a heck of a lot easier than using Coroplast.
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