The best thing to do when coating with epoxy
is to have it penetrate into the wood. This is best accomplished by heating
the wood with a heat gun seconds prior to coating. It will cool when epoxy
coat is already on and the contracting air creates a vacuum that sucks the epoxy into the wood fibers.
When you don't heat like above, the exothermic reaction of the epoxy will expand the air in the wood grain which leads to thousands of little bubbles which is what you don't want....