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Friggin green beret, are you actually hunting Charlie?
Used to do that with sheet of plywood for roof and poly. Smaller the better for heating up and holding the heat. Used 4x4 piece of plywood as shield from exploding rocks. Get them hot enuf, the cold water can send shrapnel flying. Amazing how fast you can blow holes through the poly when that happens.
…..better to have it and not need it than need it and not have it.
Good pictures