There is no such thing as one-coat coverage.

Repeat after me: there is no such thing as one-coat coverage.

REPEAT AFTER ME: THERE IS NO SUCH THING AS ONE-COAT COVERAGE.

There are not, have never been, and CAN NOT BE such a thing as a paint that achieves full coverage in a single coat. It's not even a proterty of paint, it's a restriction governed by laws of physics.

Every single statement to the contrary made by every single paint brand is nothing short of an outright lie.