[Cob] RE: ashes and salt concrete and Marlin are you out there?

[Mary Lou McFarland]

On Marlin's outtathebox website he mentions his recipe for Roman concrete.  
If he would post his recipe you could compare your mix with his.  It seems 
to me that combining the mixes might be a good experiment to try.  His mix 
would have strength and water resistance and your mix has that interesting 
shiny emulsion.  Might turn out  really cool.