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What we did was put a load of screws in the floor at 30cm intervals and used a laser level to screw them all into the right head height. Then we had a reference point to pour to.
If you set the level on a shelf you could use a line mark on a vertical stick and walk around the room to figure out where the low points are.
seager
I smoothed it all out and pushed it into the corners with an 18" trowel and spiky roller. A long batton would have been more effective, I can see that.
It's a two-part SLC I've used (arditex na) so I was married to the manufacturer's ratio of powder:latex (1 bag to 1 bottle). It came out pretty viscous and I imagine a thin skim coat is unlikely to run into the low spots unless I have a way of forcing it in there. Perhaps I could try upping the latex in the mix? The data sheet does suggest you can do that for smaller areas.