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Have used their sealer on the girlfriends jeep, I didn't really see anything special about it. Apply, wait 10-15 minutes remove. I don't believe it made much of a difference washing bugs and bird bombs off it was a nightmare, very hard to get all of it off.
Sealer should be applied to bare clean paint. waxes etc are a topper to the sealer.
It says to put over clean and freshly polished paint, not fresh wax. Sealer does just that, seals paint under it, if you have swirls and containments in your paint, they will be sealed as well. Polishing the paint will remove these before the sealer is applied.
This of it as a basic ceramic coating. Before you apply the ceramic, you polish and correct the paintwork so the ceramic will " seal " off the nice high gloss paint. If you don't polish and correct the small blemishes they will still be seen under the ceramic.
Your mixing up polished paint with wax. Two separate processes / products. A polish will make the paint look as nice as said product can, but has no protective qualities to it. wax is the opposite, it has protective qualities but has no polishing compounds in it. ( unless you have a 2 in one wax but we won't get into that here.
"pre-polished" paintwork" The pre means before so you would apply it before the polish, not after. That would be post polish.