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Who said it's not closed cell? If it wasn't they wouldn't make surfboards out of it right?
You can line the inside as a temporary solution, but it won't last any longer then a disposable cooler would. You can permanently convert it but that means cutting the top off to foam and glass the inside and under the top (epoxy only!).
You can line the inside as a temporary solution, but it won't last any longer then a disposable cooler would. You can permanently convert it but that means cutting the top off to foam and glass the inside and under the top (epoxy only!).