How long does Meguiars Ultimate Liquid Wax last?

Meguiars rates it for up to about four months. Real-world life depends on sun, rain and washing, and many owners report two to three months of strong beading.

Is it a wax or a sealant?

It is a synthetic polymer sealant rather than a natural carnauba wax. That gives it easier wipe-off and less white residue on trim than a paste carnauba.

Can I apply it over a ceramic coating?

Yes, it can be used as a topper for slickness and gloss. It will not add coating-level durability, and it may mask the coating's water behavior until it wears off.

How much does one bottle cover?

A thin coat on a mid-size car uses very little product, so a 16 oz bottle lasts many applications. Apply thin; thick coats only make buffing harder.

Does it work on black plastic trim?

It is safe on painted surfaces and leaves no chalky residue on trim, but it is not a trim restorer. Keep it off unpainted rubber and textured plastic you want to stay matte.