I worked at a geo-polymer start-up. One huge hurdle is sourcing the right kind of ash, and other ingredients, in sufficient quantities and with the right level

I worked at a geo-polymer start-up. One huge hurdle is sourcing the right kind of ash, and other ingredients, in sufficient quantities and with the right level of quality. Building a kiln or a launch pad is one thing, but building a road is orders of magnitude more expensive. Like, it's humanly possible, but it's not economically possible.