This is the finish on our old car after its winter storage and a very quick wash and polish with the ultra deep shine but now wonder if we should use a different product on the A4?
I'm a big fan of using up what you have already before splashing out on a tonne of new stuff. Ultra Deep Shine will be fine on black. If you read the bottle it's specifically for darker colours. If you want it to last a bit longer you could add some wax on top. Autoglym HD wax works well. Don't be tempted to put Autoglym Extra Gloss Protection on top as it won't bond properly. If you have a look on AutoGlym's website they talk about this.
The reason the wax will make it last longer is because Ultra Deep Shine is an all-in-one (AIO). This means it's a polish, cleaner and protection layer, all in one. Obviously doing a bit of everything means it won't last as long as a dedicated protection layer such as wax. Hope that is of help. A bit more here:
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