self-leveling underlayment didn't level?

[Peter Palma]

I'm installing a ceramic tile floor in a bathroom.

The floor wasn't quite flat, so I bought two bags of latticrete "self-leveling" underlayment at the big box hardware store.

According to the directions, I just needed to pour it on and it would self level itself flat.

The problem is, it didn't level itself.

With a float and a lot of work, I got the floor fairly flat, but there are some high and low points.

Two questions:

1) Did I do something wrong or does this product not really work?

I did follow the directions on the bag.

2) How do I sand/grind down the underlayment at the high points to get it closer to level.

There is definitely an extreme hump in one area that has to be smoothed down before I lay the tile. It's too extreme to just level out the rest of the way with thinset.

Any help/suggestion is appreciated.

[m Ransley]

use 36 or 50 g sandpaper with a pole sander or electric , " self leveling " its like an eat all you want diet, it still takes work.

[Rob S]

My best guess would be you didn't mix it thin enough. It should pour quite well and fill any low spots. I've used it severla times and only had problems when I used too little water.

RS