Wax CPC’S are designed to prevent rust/oxidation attempting to stop (salt)water to contact the metal. They do not interrupt the corrosion, actually often help to enclose the problem. This can create problems by covering up the abuse, allowing it to grow underneath. CorrosionX is superfast to apply , then penetrates i.e. into a hydr. fitting and down the assembled parts. Coated surfaces can still be inspected and worked with.