Tire Pressures

I run the mt sportsman pros right now and going to switch to drag radials. I was told from harlow tire to lose the tubes get rid of unsprung weight and to take dawn dish soap and smear all over the inside of the tire. Sides and bottom to seal it. Works great! My pros can sit all winter and no leak down. He told that he does that on 8 and 9 sec. car tires.