meh, his manager apparently lied about how he did it then as the makers of the product he claimed to use stated the product wouldn't work in that manner, and the steps he claimed to have gone through, were later proven to be pointless and would have almost surely have damaged dempsey's hands as well.
99% of the news we get is second and third hand, do you deem all news in papers, tv, websites, etc, to be unbelievable on account of that? If you did not read the article I linked earlier on this subject, and it seems as though you may not have, maybe give it minutes someday
According to Kearns this is how he loaded Dempsey’s gloves, “I quickly wound on Dempsey’s bandages under Moynahan’s vigilant inspection. After I finished with the wrappings I turned to Jimmy DeForest, my trainer, and pointed to the water bucket. “Give me that sponge well soaked with water”, I ordered, “I want to keep the kids hands cool.” The sponge, dripping with water, made a sloshing sound as I clamped it to the bandages on Dempsey’s hands. In a moment they were drenched through. “Now the talcum powder,” I directed DeForest, and he passed me the innocent looking can. I sprinkled the contents heavily over the bandages.” Moyhanan made no comment. Dempsey, who was entirely innocent of what had happened, stood there in almost a stupor. I had to smile as a call came to enter the ring.”
That is how Kearns said he loaded Dempsey’s gloves without the fighter knowing anything about it. But is such a thing possible? One must first ask is it possible for Dempsey to have entered into the ring without gloves, which the film and still photos clearly prove, and the referee and principles not noticing the hardening substance on his hand wraps? More importantly is plaster of paris a good and efficient way to load a pair of gloves?
Boxing Illustrated conducted an experiment to test whether it was possible to use plaster of paris successfully under fighting conditions. The results were reported in the May 1964 issue of BI, pp 20-24, 66. Hugh Benbow and Perry Payne (manager and trainer of Cleveland Williams) used plaster of paris on Cleveland's hands and reenacted what Kearns said occurred in Dempsey's dressing room. After 35 minutes of toasting to reenact the 114-degree heat of Toledo that day, Cleveland Williams hit the heavy bag five times. Benbow examined the wraps and found that the plaster had cracked and crumbled. "This stuff." said Cleve, "wouldn't do anybody any good."
The Boxing Illustrated test proved beyond a reasonable doubt that the plaster of paris would not have held up after the first punch, it would have crumbled and left chunks in his mitts and every punch thereafter would have been quite painful and there is little doubt he would have broken his hands. The inventor of the product issued a statement as to the impossibility of using plaster of paris without breaking all the bones in the hands. Dempsey’s hands were not broken and he continued to punch with authority with both hands. This alone dispels the idea that Dempsey’s gloves were loaded with plaster of paris.