I heated mine over a bed of coals. When wood is really hot, the wax will suck right into the wood, and little moisture bubbles, or expanding gas comes out of the wood. As the wood cools, it pulls the liquid wax deeper into the wood.
I have finished maple salad forks and spoons this way, and I can leave them in the sink, or stir tomato sauce, and never a problem with water absorption or staining.
PC or not, it's a great finish.