TotalBoat Fathom Deep Pour Epoxy Resin can be used to fill larger holes, but it will take significantly longer to cure if the holes are smaller. Fathom can be applied at a minimum of 1 inch or up to 2 inches deep per layer, or up to 3 inches if no more than 1 gallon of epoxy will be used. Make sure the surface of the wood is sealed before applying Fathom.