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I guess you always have the option of taking the new rolls to a local galvanising firm and have another layer put on. More expense I know, but at least you would be confident that it would last.

Great greenhouse Christine. You really have me wanting a greenhouse along similar lines.
I'm just wondering if filling the bottles with water would help stabilise, or even out the temperatures, during the summer. But then, the whole thing might freeze up during the winter..... hmmmm....