Method for treating thermoplastic polyurethane golf ball covers

A method of forming a golf ball, the method comprising:

• placing a golf ball precursor product in a solution to create a solution covered golf ball precursor product, the golf ball precursor product comprising a cover comprising a thermoplastic polyurethane material, the solution comprising a hydroxyl terminated polybutadiene in an amount of 10% to 30% by weight of the solution and a solvent;
• removing the solution covered golf ball precursor product from the solution;
• heating the solution covered golf ball precursor product to remove the solvent to create a pre-treated solution covered golf ball precursor product;
• placing the pre-treated solution covered golf ball precursor product in an isocyanate solution to create a isocyanate solution covered golf ball precursor product;
• and
• heating the isocyanate solution covered golf ball precursor product to create a final golf ball precursor product.