Waterproofing structure

Looking at options for waterproofing an earthbag structure here in North Alabama, where we get a good bit of rain. Aside from not being a natural, local building product, what do you think of something like this? http://www.homedepot.com/p/ANViL-5-gal-Acrylic-Crystal-Clear-Coat-Sealer-209730/204144101?cm_mmc=shopping-_-googleads-_-pla-_-204144101&skwcid&kwd=&ci_sku=204144101&ci_kw=&ci_gpa=pla&ci_src=17588969

Some other suggestions I've gotten are large overhangs on a traditional roof or covered porches, along with bricking (my partner's personal preference). However, if we can find a way to make it reasonably possible, we're interested in a dome structure instead of a traditional roof. Would, perhaps, a living roof structure make this possible by absorbing the water?

I'm not sure that is the right product. I think you need something more like this - http://www.homedepot.com/s/elastomeric%2520coating?NCNI-5. I know it comes in other colors, just maybe not at Home Depot. This is the type of product that was recommended to us by Owen Geiger when we asked about a waterproof coating. This is also what is recommended by the folks at Monolithic Dome - an elastomeric coating.

You want flexible. Elastomeric if you want to seal it. But you are then going down the path of barriers and need to control humidity and condensation. It can be done, but takes attention to detail.