When you say: “For the best-looking results, you should recoat the entire surface.” I can’t find anywhere that tells me HOW to do this. The piece is 6″ x 6″ x 1″, two sides are sticky, and the back (that was in the mold bottom. I can’t re-pour it, it’s out of the mold. Do I brush mixed resin onto the two sides? What about the back? Would I wait for the sides to cure, then tape off the sides and our a clear layer onto the sticky back side? Thoughts?