i will say this about E.G. make sure you go with a slow hardner with the longest working time. it takes a good 30 minutes before the air starts to work it's way out during vibrating. my findings were that it has about the same compression strength as concrete. it took about 3000 psi before the structure fails. shrinkage is about .001 inches so very little concern on that part of it. i figured it would take about 9 gallons of epoxy for the needs of this project.