There are several coatings and finishes that can be applied to a zipper to improve its abrasion resistance. Some common coatings and finishes used for this purpose include:

1. Silicone: A silicone coating can be applied to the surface of a zipper to improve its resistance to abrasion. The silicone creates a layer of protection that helps to prevent the zipper teeth from wearing down or breaking.

2. Teflon: Teflon is a non-stick coating that can be applied to a zipper to improve its durability. The Teflon coating helps to prevent dirt and debris from sticking to the zipper, which can cause abrasion and wear.

3. Polyurethane: Polyurethane coatings are often used on zippers to improve their water resistance and durability. The coating forms a protective layer that helps to prevent moisture from penetrating the zipper teeth and causing corrosion or wear.

4. Nickel plating: Zippers that are made from metal can be coated with nickel to improve their corrosion resistance and abrasion resistance. The nickel coating helps to prevent the metal from oxidizing, which can cause the zipper teeth to wear down or break.

5. Powder coating: Powder coating is a process in which a dry powder is applied to the surface of a zipper and then heated to create a durable, protective layer. The powder coating can help to improve the zipper's resistance to abrasion, corrosion, and other types of wear.

These coatings and finishes can be used alone or in combination to improve the overall durability and performance of a zipper.