In this L-shaped bathroom, one corner was very high, dropping a full inch toward the built-in shower.
The floor dropped nearly 3/4 inch toward the entry door.
Before the primer can go down, the author sweeps the floor clean of dirt and debris.
The author pours pre-mixed primer into a bucket.The primer helps with adhesion and helps to seal the underlayment so that it doesn't absorb water from the leveler.
A coarse floor broom is perfect for applying a generous coat of primer on the underlayment.