I have a pair of camp shoes that is about 100 years old. The heels were worn completely through so that the inner white layers shown. (The soles are black rubber.) The tops must be made of rhino leather because, although they are wrinkled in the standard creases, they have worn like iron. It must have taken me 10 years to break them in. I was going to throw them away after a cobbler informed me there was nothing he could do for them. I ordered the Shoe Goo (black), built a dam around the back of the shoe with duct tape and placed the Shoe Goo until it reached a level that co-insided with the sole level. The Goo is so elastic that it is self leveling so the shoe must be left to dry in a level position. After 24 hours the Goo was dry and the tape removed and a repreive was issued for my two friends of these many years. The Goo, too, wears like iron. Excellent product. Highly recommended.