I'm not so "sold" on the adding salt idea...From what I have read, it can greatly weaken the integrity of the cement...but that can be overcome by adding other items into the mixture. Other thing about salt, is that it needs to be "boiled" out of the MMLR (well...not quite boiled...but up over 130 F).
Since I am planning on making 1 fairly large structure...I would have no way to boil something that big
