Thanks for the feedback dazlight.
I will be placing Trafficmaster Allure Ultra/Clic Vinyl Plank Flooring on top. The specs allow 1/8" difference over 4'. Two of the room's walls are on the edge of the foundation, and parts of the concrete slab have settled about 3/8" below the foundation edge...
A few years ago I applied SLC to a 30 square foot area using LevelQuick RS (Rapid Set). It ended up setting while I was still trying to encourage it to spread evenly, which resulted in a bit of manual fill after.
I'm going to tackle a larger area, about 160 square feet, and I'd like to avoid...