Questions on using leveler over concrete slab

[Douglas Fir]

From YouTube ive seen, leveler gets applied to the entire room (on concrete slab). In what circumstances can leveler be applied to a fraction of the room?

Also, how long should I wait before the moisture content stabilizes before engineered floor can be installed?

Thanks!

 

[Ernesto]

I do low spots all the time over concrete with SLC. Just did a few spots today in a hallway.
Screed it flat with a 6ft metal screed. Use primer first. There are some quick set SLC but rule of thumb for gluing to it is 12 hours in a dry climate. 24 in a humid climate.
Since it sets very smooth one should hang around until its setting and drag a broom over the it. Light broom finish is what your going for so the glue can grab.
For floaters it's not an issue.

 

[highup]

Never heard of brooming it. Figured self leveling concrete designed for flooring were designed to accept adhesive.
............ that said, it's an interesting idea.