It must be easy to work with and it must adequately fill in gaps between the tile and the substrate.
Tile not sticking to wall.
Wash the wall with a mixture of 1 part mild dish soap to 6 parts water.
The problem is the size and weight of the tiles first is the tiles porcelain if so they should not have been fixed to plaster walls and you should of use powdered adhesive ready mixed is only good for ceramic tiles up to 300 x 300 the walls should be clad with tile backer board including the smooth finished wall and any priming should be done with sbr diluted.
Then prep the wall and use the adhesive made specifically for the tile you have.
Or take them all down putting wax paper between each tile so they don t get damaged.
It cannot cure too fast.
Could be as simple as not using the correct size trowel the back of the tile has to be covered 90 percent with thinset.
Demands placed on tile adhesive are both extensive and steep.
Just lay it lift it back up and check for coverage.
Do not clean them with a solution that is gritty or has crystals in it as that could mess up the adhesive in the tile backing.
Otherwise you do not have adequate working time.
Tile won t stick to thinset.
Many people think that with peel and stick tile you should not have to use adhesive at all.
Fixing a tile that pops up later if the corners peel up heat the tile to reactivate the adhesive then place a stack of heavy books on it to weigh the corner back down.
Sometimes self stick vinyl tiles won t stick only after the fact.
Stick the suction cup with the silicone to the tile as usual.
To fix a tile that pops up later reactivate the adhesive by heating it up with an iron.
If some silicone has leaked around the suction cup don t worry just wipe the excess silicone from the tile with a paper towel or a cloth.
Ok this problem pops up all over the internet i renovate really old buildings for a living for the passed 35 years.
Use gorilla glue to replace each one.
Be sure to spray the wall surface with water to activate the glue.
If the wall is wet the tiles will not stick.
Tile adhesive is expected to hold the tile in place not just for years but for decades without fail.