It is normal PVA glue, but make sure it was spread in a very thin layer, as it will soak through if is too thick. The resin I used is call Kraft Kote. At the end of day you could use most self-levelling resin with low viscosity and long setting time. Clear resin for River Table Top, or resin used to seal photo/ canvas are ideal for this process. (Don't use anything resin you got from hardware store, they are lightly to be old.)
As for the edge, go have a look at post #17, there is a indentation on the edge, hence when apply resin you could sand it back to level the edge. If i have redo this project again, i will start building the edge with resin first, once is think enough, do the flood coat.