Yes. Simply scuff/sand the surfaces prior to applying the structural fillet so that you can be assured of a strong joint without over-doing it with too much epoxy. You can also have the joint taped off, to control the contact area. At this point, let the joint cure keeping an eye out for bumps or drips since this joint will be very difficult to sand/fix. [Optional step for extremely strong joint: When dry, I use epoxy with no additives to wet-out the joint and surrounding area, lay down the fiberglass cloth, and wet-out the cloth with an epoxy brush or roller]. The final step is to add copius amounts of microballons to your epoxy mix and spread it on the joint (after all the previous steps have cured of course). Once that is dry, you can shape it or sand it as if its a high-quality wood filler. My experience has been if you add more ballons to the mix, its easier to sand. As this joint sets up you can start shaping it with a round dowel or tube, so that by the time its almost cured, it has the shape you want. The epoxy I use is West Systems, I haven't used the Aeropoxy.
