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To make sand castles that are worthy of prize money takes custom tools. For a look inside a pro's toolkit, Popular Mechanics talked to the world's top builders. Here are their secrets.

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Professor Bennett advises sandcastle builders to add one part water to every eight parts sand – which means for every bucket you fill during construction about 12 per cent should be water.

Now the experimentation we did suggested that the perfect sandcastle requires one bucket of water to eight buckets of dry sand. Or if you want the magic formula: Water = 0.125 x Sand.