Step 14: By now a number of pieces had been applied, repeating the process mentioned before to build up an entire arm prosthetic, colouring and matching to make sure it flows as a continuous piece and the colouring is the same throughout. This could have been the final step but after a bit of thought we really wanted to nail the translucent, almost wet look that flayed muscle has, and after a bit of experimentation we settled on good old ky jelly. Just enough of this really brought together the look and left a plasma-like appearance to the muscle that finished it off better than we could have hoped.