looking for a long lasting coating for tires and rubber bumpers on several volvo 240's. Car pro pearl coating is $80 5 litre, can be diluted, lasts perhaps? 3 months maybe. same outfit has meguires 2 types 1 gal. $30 or $40 coatings, don't seem to be rated as long. Thoughts? Would like long lasting black effect. Experiences from anyone? Thanks!