Or as an alternative depending on the strength of the adhesive is using a good strong scraper.
Scrape tile adhesive off wall.
Scrape down the walls with a putty knife removing the softened adhesive.
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Tile adhesive is very strong it would take a lot of time and effort to sand it down.
Usually you can get a few bits of the adhesive off from scraping the tiles.
The two most common wall tile adhesives are thinset and mastic.
Scrape the surface of the adhesive with a stiff bristle brush.
The best solution is to skim over with bonding creating a nice flat surface.
Scrape off the adhesive.
Repeat the process until all tile adhesive is removed.
Answered 20th jul 2011.
Once the mortar softens up scrape it off with a 4 scraper or a wallpaper stripper.
By working with patience and with great care you will remove the largest amount of the wall tile adhesive.
When the adhesive is softened through and can be easily cut through with a putty knife it is ready to come off.
Make sure to pva the wall before tiling again.
But other parts of vinyl tile adhesive may take more time to come off completely.
This may take a while depending on the size of the wall and the amount of adhesive you need to get rid of.
The critical aspect is to scrape the adhesive off the wall surface as much as possible by using a wide chisel and a hammer.
If you damage the wall significantly you have to repair it before installing the new tile.
Thinset is a cement based product and mastic resembles thick glue.
The first step is to use a putty knife to scrape off the adhesive while applying heat to the adhesive to soften it up.