That stuff might work as well. Congrats on making a wonderful breakthrough. We looked into the shrink wrap idea, which would work very well indeed for kit if you did not need to get access to any switches or controls. Its cheap and all you need is hot air to make it shrink. It could be removed to change mags and quickly reapplied, I suppose.
Cling film is another alternative.
I went down the PVC tape route because I needed full access to all camera and lens controls. I was surprised how well the plastic bag over the lens worked. It looked amateurish, so did we staggering around deck, but it worked a treat. We did not cover the hand grip part of the lens as it would have become very slippery. We simply cut and taped the plastic bag so that the hand grip part of the lens was exposed.