How thick can you lay tile adhesive?
Also, how thick can I lay Thinset?
The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. For example, a 3/8" notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement.
Accordingly, can tile adhesive be used to level floor?
Setting floor tile with mastic is one of those things that the industry does not encourage. These adhesives have little to no leveling ability on a floor, and take forever to cure, specially with larger format tile. This stuff should never be used as a leveler.
You can use thinset to install tile over an uneven cement floor and leave the floor perfectly level. You can also use thinset mortar to level out an uneven cement floor or fill small holes in the floor without installing tile.