However, it does meet the minimum requirements of A118. 1 for unmodified thinsets, so, it should work. Since you mixed it too thin and spread it with the wrong trowel, it will take longer to set up. BUT, mixing it too thin also makes it weak.Click to see full answer. Also question is, what if my Thinset is too thin?Thinset, once mixed, should resemble warm cake icing. Not too thin, but thin enough it’s pourable or it falls off the mixing knife. Only mix enough thinset as you can use in 15 or 20 minutes. Use a crack-isolation membrane under the thinset, when possible, to prevent cracks.Additionally, how much thinset should I mix at a time? But that’s way too much thinset to use at once, so I decided to just start with 1 quart of water, which is about one fifth of the bag, which is an easily manageable amount. You never want to mix an entire bag on your first time because the thinset will likely harden before you have time to put it all on. Subsequently, one may also ask, how thick can you go with 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.Can you rewet Thinset?There is no way to save mixed thinset. Thinset cointains portland cement, which chemically reacts with the water you add to harden. It does not dry by evaporation, so if you mix up a batch of thinset and pack it in an air-tight container, it will still harden in a few hours.