If you are thinking of Ceramic or porcelain tile the quick answer is NO!!
The moisture in the adhesive/thin set will likely make the wallpaper release at the worst possible time. It needs to come off & the substrate needs roughed up a bit to give the thin set something to mechanically bond to.
If this is a wet area like a shower or tub surround DRYWALL is a NO NO too, should be green board.
Tile
I wouldn't .
Yes you can place a vinyl wallpaper over and over, but it will not be long lasting.
Firstly you can try to wet them hot water. But you need to keep them wet for some time. Slowly you will be able to realize that the wallpaper tile is getting ready to be removed.
You can tile over existing tile although it isn't reccomended. You would be safer by removing the tile and then installing the new tile. But, if you wanted to tile over existing tile you would have to make sure all the tile is even and not lose. If the tile is lose or uneven it will caused the new tile and grout to crack or pop out.
form_title= Wallpaper for Windows form_header= Find wallpaper that fits over windows. What do you want the wallpaper to look like?*= _[50] Will you install the wallpaper yourself?*= () Yes () No What is your budget for wallpaper?*= _[50]
can you just wallpaper over paneling and not do any thing else if it has small groves
yes
Yes you can
you can put it over but the wall will look a bit fat
soak with water until it softens and thegently scrape
yes