@Avanti posted:Using urethane finish is a great idea. But, I would skip spraying the inner layers. Just build a loose pile slightly smaller than your target, and build up just enough layers to make it strong enough. This produces a hollow pile which is lighter, uses less material, and makes no difference visually.
Pete, that is a good idea. I would spray an additional coat to the underside of the pile after removing it from the inner pile to seal it.