I need to make a hollow sphere for a project that is supposed to look like a bomb. Any ideas?
You could buy a premade sphere and then spray paint it? Why make a sphere when you could easily modify a pre-made one? There are a lot of solid plastic ball toys at petshops, for example. Or you could even buy a weight ball like this: http://www.ymoshop.com/index.php?main_page=product_info&cPath=93&products_id=10592. Or buy a bomb shaped candle at an online novelty store.
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drop acid into a solid sphere.
Paper mache over a balloon, let it dry and pop the balloon with a pin.