I use epoxy, ca, and aliphatics. If the piece requires rubber bands, pins, clamps, etc, etc, to hold in place I use ca to avoid the use of these hold down devices. Generally I use ca on bent balsa sheeting and stringers. I use epoxy for engine mounts, cowl lining, servo mounts, and landing gear and wing mounts. I use aliphatic for everything else. I try to use aliphatic glue as much as possibel because its strong, sands well, and most important of all ---- it forces you to patient.