Facing the task of leveling the walls for a future toilet and realizing I need to apply a layer of filler, about 5 mm, before tiling. However, I'm a bit uncertain about which product to use. Normally, it's a bucket of coarse filler, but why not use Finja Laga Vägg? I've worked with it before and find it very easy to work with and it would be cheaper than buying lots of buckets of filler. But I can't find anywhere, except in the product datasheet, that it can be used for applying filler and leveling walls. Is there any reason not to use Laga Vägg for this purpose?