DEtileD

Bal Grip/Whitestar Ardex D30/D20
If you stick to those and follow the rest of the instructions you shouldnt have a problem. Keying the surface and scraping the existing grout lines never hurt anyone either.
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GazTech

[quote=Unregistered;95591]in my experience, it is fine to go ahead and aply new tiles onto existing tiles. just make sure you give them a clean first and use some adhesive that is suitable, most ready mixed tubs of wall tile adhesive can be used, but, I tend to use one that is a level up from bog standard (some are self priming), Just make sure thouroughly read the small print on the side of the tub/packet they usally state the limmitations of the product. and give it plenty of time to dry out before grouting, at least 3 days and a lot more for big tiles.

i have assumed you are using ceramic.

bigneil[/quote]Any size above 30 x 30 mm it is advised to use powdered adhesive, especially porcelain will need to be polymer modified to stick to it.....Gaz

[B]"[I][COLOR=darkgreen]The bitterness of poor quality remains long after the sweetness of low price is forgotten[/COLOR][/I]"[/B]

IGTiling

If you use Bal Rapidset then you will need to need to add Bal Admix AD1 to the mix to improve the adhesives properties - I would advise the use of Bal Grip.

ferdon

Would these suggestions still stand if the tiles also had a coat of paint on them as well?

devonmark

I know you can tile over tile but I won't....and here is a prime example of why not, a few weeks ago I got a call to tile a bathroom, went and had a look, they wanted me to tile over a large format tile, the walls were already done floor to ceiling, I refused and said that if they remove the tiles and I would happily do the job, went back this evening after getting a call to give them an estimate and there was the bathroom with half the tiles removed and guess what....there were tiles underneath the ones they wanted me to tile over, these were also a large format tile...could have been three layers of tiles on eggshell walls..

Plastering & Tiling Solutions.

GazTech

[quote=IGTiling;113548]If you use Bal Rapidset then you will need to need to add Bal Admix AD1 to the mix to improve the adhesives properties - I would advise the use of Bal Grip.[/quote]Bal Grip being water dispersal cant rely on the moisture dissipating into the tiled wall, therefore extended drying time is to be expected....Bal single part flexible is more suitable, because it chemically sets....Gaz

[B]"[I][COLOR=darkgreen]The bitterness of poor quality remains long after the sweetness of low price is forgotten[/COLOR][/I]"[/B]