Backyard rink building question.?

I was talking to a friend the other day about building a backyard rink. He told me he bought from Walmart a kit that fills with water, then when its frozen, you peel off the top and theres your rink. I am guessing its like a Waterbed Bladder to some extent. Does anyone know of this product and if so, whats it called? Also, if you do know of it, is it any good?

i believe its called 'BUILD IT YOURSELF ICE RINK'

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