What a strange thread.
Coatings over the paint will help minimize swirls in the clear (as you aren't working directly with the clear at that point), but it's important to remember that *you*, the owner, is who creates these swirls in the first place.
The softer the paint, the easier it is for swirls to form on the surface. Sometimes just using a cheap microfiber is enough to create maaring.
Wax, sealant, opti-coat, or a layer of anything that prevents particulates from moving over the clear coat surface itself will help minimize swirls, but the best thing to do is to remember that whenever you touch a panel it should be well-lubricated to the point that dirt will be encapsulated in whatever detailing product you're using and pulled away from the paint before removal.
no amount of wax, sealant, or hard resin (like opticoat) is going to prevent damage to your paint without proper technique. *with* proper technique, these coatings can help you be a little more reckless in your treatment of the paint without having to worry about damaging the clear. this may mean you will be able to use a lower-quality microfiber, get away with using less detailing spray on a lightly soiled vehicle, etc.
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