Roll out the sheet of film and lay your object on top.
Use scissors or a knife to cut out a piece of the film that is big enough for your object.
Imagine the film is wrapping paper and you are wrapping a birthday present. You need enough film to cover all sides of the object.
Remember that the piece you cut out must still be small enough to fit in your tub of water.
Be careful with the film once you take it out of the bag. If you accidentally get it wet, it will begin to dissolve.
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