The wing panels use an aluminium tube spar and anti-rotation pin similar to plug in wings however they have to be glued together to make a one peice wing. Epoxy is applied to the tube and root rib area and the assembly clamped and taped together. You don't need tons of glue here as the fit is quite good and you don't need to fill any gaps. I used Z-Poxy finishing resin instead of 30 min epoxy.