After casting the shape in a form, with foam inserts for the blade, and letting it cure for a few weeks, I etched the concrete with muratic acid. Using a slightly diluted solution, it removes the calcium layer from the top, making the surface less powdery, and easier for paint to adhere.
I backed some black leather shapes with cardboard, and cut some steel for a gasket and cover. I sanded and polished the steel, and secured it with JB weld. I’m very happy with how this turned out.
I drew up the emblem in AutoCAD, printed out a stencil, and painted it. I handled fine touch-ups with a sharpie, and any mistakes with a small file.
Fancy park shot! (I am a bad photographer)