Quote:
Originally Posted by accyman
i think unless you drill or break them they are waterproof.
leave one in a bucket of water for a few hours then smash it and see if its dry on the inside 
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Why not weigh the brick, then put in water, then weigh again.
If the brick is heavier it's absorbed water, if it's the same weight it's waterproof.
Nah, not as much fun as smashing bricks is it?