sorry draconis... i've been dealing with my own tragedies. as far as the mortar i will have to disagree. concrete is mortar with sand and rocks. concrete is pretty stable. what would be difficult would be making it stick. starting out very thin (some people use spray bottles for their first layer for coverage) and working thicker with each layer should give you a base to work with. the rougher the better just before you add your final eco-earth mix.
as for the foam i am not sure what the question is.
when fixing concrete structures often will the new area (the patch) crack. if you let your concrete (mortar) cure too much between applications you will have to address that problem. a concrete bonding agent might be necessary. i believe that is what the flevopol was in the first place anyway. i am providing a google shopping link to show you some products. remember though not all of them are just right for mixing like he did. best way to use some is to mix them in while the ones i've used (in construction) were poured and trowed into grooves and crevices and immediately covered with fresh crete.
concrete bonding agent - Google Product Search
if you already have the mortar i would not just go buy a bonding agent until you are having a problem. i could make it work without it. after all the egyptians made brick out of clay and dirt from the ground, straw from the field and lye (which is already in your mortar).
" - mrcarabao 2009
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