I am working on a walnut live edge slab and want to fill some rather large voids with epoxy. They are about 2 inches deep, 2 to 3 inches wide and 3 inches long. I am going to seal off the bottom with aluminium ducting tape. My question is how thick should my layers and how long to dry or cure? I have been told to pour the epoxy in layers to avoid heat build up and possible boiling. I will use a medium hardener 30 + minutes use time. Can I pour another say 1/2 to 1 inch layer say in two hours. I am thinking of using System Three General use of West System. Any other recommendations on epoxy for table tops. I intend to buff off the high gloss to a medium sheen.