Once the mortar softens up scrape it off with a 4 scraper or a wallpaper stripper.
Scrape tile adhesive off wall.
This may take a while depending on the size of the wall and the amount of adhesive you need to get rid of.
Step 3 wipe some tile adhesive remover over the surface of the wall.
Thinset is a cement based product and mastic resembles thick glue.
Gently grind off thinset with an oscillating tool equipped with a.
Scrape the surface of the adhesive with a stiff bristle brush.
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Tile adhesive is very strong it would take a lot of time and effort to sand it down.
If any adhesive gets stuck to the brush remove it by hand and continue until no more adhesive remains on the wall.
Usually you can get a few bits of the adhesive off from scraping the tiles.
Scrape off the adhesive.
The first step is to use a putty knife to scrape off the adhesive while applying heat to the adhesive to soften it up.
When the adhesive is softened through and can be easily cut through with a putty knife it is ready to come off.
The best solution is to skim over with bonding creating a nice flat surface.
Repeat the process until all tile adhesive is removed.
The two most common wall tile adhesives are thinset and mastic.
The critical aspect is to scrape the adhesive off the wall surface as much as possible by using a wide chisel and a hammer.
By working with patience and with great care you will remove the largest amount of the wall tile adhesive.
Scrape down the walls with a putty knife removing the softened adhesive.
Make sure to pva the wall before tiling again.
Answered 20th jul 2011.