I don't use everything Meguire's makes but I can say for a fact that the Next Generation Tech Wax has really helped the finish of my 46 Ford. Its not black but it does have a dark blue basecoat-clearcoat paint job. As stated above the wax job last only for a time and then it needs to be applied again but the results are very good as opposed to other products from other companies. Also as stated above a random orbital buffing every now and then and using a clay bar correctly can helped as does keeping the car in a garage especially during hot sunny days. Hope this helps.
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