Mr. Purple Cat Esq. - 2015-07-13 Remember that Canadian guys aluminium casting video and all his advice on the various ways molten aluminium can cause wet concrete to explode and so on?
jfcaron_ca - 2015-07-13 Yep, I immediately thought of that advice when he purposely wet the sand before pouring the metal. I guess that happens in hobbyist circles: one person's anecdote becomes a rule, with lots of contradictions around.
fluffy - 2015-07-13 It's almost as if sand and concrete have different material properties.