Spit shining is an old technique used by shoe-polishers to get amazing results. This technique can also be used with applying wax on cars. The technique needs some practice to master properly, but can give amazing results.
A sealant is protective product that is made up out of polymers. If they contain wax, they are considered hybrids. Sealants come in several different types and are the step between natural wax and completely synthetic protective products.