Floating shelves - skim coat over supports?
I plan to put up very long wood floating shelves in my kitchen (as opposed to wall cabinets). I'm not too confident about the floating shelves that insert into rods set into the wall - they don't seem to hold much weight when they are the length I need them to be (8 feet). What I would like to do instead is screw L-shaped steel corner braces into the studs, facing up and out like L's sticking out of the wall, then place the shelves on top and connect the metal to the wood from the underside. Then I'd like to skim coat over the portion of the braces that are screwed onto the wall so that the shelves appear as if they are floating. Of course, the braces would have to be notched into the wall so that the skim coating doesn't create unsightly bumps. Has anyone done this? Would the skim coated areas crack over time from tension in holding up the shelves? Thanks in advance for your help!