Yeah, you heat treat it once properly, then do it again in 4" sections, rubbing in the pine resin mix while hot, all the way down the bow. Then you leave it a full day, and repeat about 3 times. Each time you do it, you're forcing pine resin into the wood, and when it cools it goes rock hard, adding loads of strength to the belly.
A guy in Norway came up with it after seeing it done on skateboards apparently, and he used it to take a 160lb elm bow up to 210lb.