Look for a product that will penetrate the strong fibers in leather, but beware of any that include petroleum or mineral oils. While petroleum by-products won't damage your leather immediately, they do over a period of time. Again, just as with cleaning, keep on the look out for thick, greasy conditioning treatments for the best care of your leather. There are a couple things to be wary of when purchasing a polishing agent. Some products contain coloring factors that will brush off on things you come in contact with.
Some products also have a tendency to clog the pores in leather or dry leather out.
Just as with cleaning, be sure to test out the product on a small area and when ready, buff to a shine. Protection Moisture barriers are extremely crucial in preventing rain or other liquid hazards from damaging leather. Stiffness and spouting will happen if leather isn't protected beforehand. There is a drawback in protecting leather with a moisture barrier product. They tend to fill in the pores with a greasiness that makes cleaning, conditioning, and polishing difficult, but it's a necessary process to ensure leather isn't destroyed.