Re:You could always try lead. (Score 1)

Funny thing is, things like cement, paraffin and water are better shielding per unit weight.

Well, this is true, but there are usually volume considerations as well, in which lead does considerably better. Lead also holds a shape better than water does, and is unlikely to short circuit equipment. And if you are using paraffin, better keep your machine cool, or you'll have the same problems as with water.

(First /. post!)