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hmtiling
I try to give levellers as long as possible when gone in at depth but we all know sometimes you can't. I certainly wouldn't tile on a mushy floor though.It is possible to over water some products and have no issues as such but you do weaken the compound. The main problem is creating laintence on the surface which if you don't remove your effectively sticking to dust so no real bond is achieved. Sometimes you can get laintence even when the correct amount of water is added I call these dusty screeds and avoid them Who wants extra work preparing the floor.
The other problem is drying time The longer it takes to dry the longer it takes to reach its full compression strength if at all. On average most leveling compounds take around 28 days to reach full compressive strength and thats mixed correctly be it water or latex mix.
A high compression strength for a levening compound in the UK is around 35nm which is ideal for our concrete which is normally not much more. In some countrys like Italy they use compounds that reach up to to 100nm which would just pull to much when drying and blow off or floors.
Anyway back to the point.
When we lay on our levelers they are still week and at a very low compression strength A 35nm would be lucky to be 10nm after 24 hours so by adding more water it's even weaker We then cover it with wet adhesive and tiles and slow it down even more ie laying our tiled floor on not much more than mush.
Just saying
Just saying