Cut the angle iron to size, if necessary, using an angle grinder tool.
Clean the area that the angle iron will be attached to of any dirt or concrete rubble using a brush. If you are attaching the iron to the corner of a wooden surface, sand the area lightly with coarse grit sandpaper.
Squeeze a thick bead of metal epoxy onto both inside edges of the angle iron and place it over the corner of the structure. If the edges of your angle iron are exceptionally wide, apply another bead of epoxy.
Push the angle iron all the way into place. Secure the top edge of the angle iron by placing several cinderblocks along its length.
Secure the bottom edge of the angle iron by hammering in several tack nails along its length. Insert the nails as close as possible to the iron's bottom edge and only sink them halfway.
Allow the epoxy to dry for the time suggested on the container. Once the epoxy has cured, remove the tack nails and cinderblocks.