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I am not quite big enough to justify a custom made tank and several hundred pounds of wax to dip my woodware, but hate painting enough to figure out another way. The pan pictured came with my business 25 years ago, it is 1/4 inch aluminum (almost went to the recyclers several times) Restaurant supply houses still sell a similar pan (about $150.). I can do one side at a time so obviously it takes longer but it only took 9 pounds of wax and 9 pounds of Microcrystalline wax to get started and only 30 minutes to get up to temp. Once up to temp one burner was able to maintain temp. After 20 supers, still plenty of wax to do another 20 or more.
I worked inside, not recommended in a home. I was under a commercial exhaust hood to keep the slight amount of smoke exhausting to the outside.
I did each side for 8 minutes so for 2 mediums, just over 1/2 hour. Bottom boards do not fit, but could be done from corner to corner in the pan (getting the edges no problem) and than brushed hot wax onto the center of the board. Not as good as submerging, but as the edges cooked I kept putting hot wax on the center and you could see foaming as the wood got hotter.