21 is a sealant, not a wax. you will wax over it.
sealers typically last longer than waxes, and will build up in very minor imperfections in the paint, seemingly making them disappear (they are still there, its just the light and the sheen playing tricks on you) a good quality wax follows your sealer, and will not last as long, so you will have to re-apply more frequently than sealant.
This is my understanding of how things work.... If anyone knows better, don't hesitate to correct any of this info.
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