Wax over Stripes or not ??

That is why you can wax them with no issues. If you ever look closely at matte black vinyl, it is not a smooth surface - it is actually fairly porous. As a result, wax gets "stuck" in the valleys of the material and can lead to streaking especially with paste waxes that dry and leave behind a white residue. The micro-polymer waxes do not do this but they can still streak on matte material although a lot less than paste waxes. Gloss Vinyl is usually very smooth and nowhere near as porous.