how much old adhesive do i remove

[bobby_la_mesma]

Dear All

My bathroom has 50% old tiles adhesive rigged to wall. I'm using a scraper but fear I willl be here for days. I am tiling over the wall using Bal primer APD and then using Bal Goldstar.

How much of the old adhesive do i have to remove?

So far I removed all the peaks but chipping of the near flat flakes is very time consuming.

Thanks

 

[Richard C]

It can be time consuming but you really need to get all the ridges off. You need as flat a base as possible to tile over or it will make the new tiling more difficult & reflect in the finish; old adhesive residue may also affect the bonding of the new tiles. Depending on the old adhesive type, damping down with water might help or even a steamer but don’t leave it in one place too long or the heat will blow the plaster of the wall.

Can I ask why you’ve chosen APD primer & Goldstar?
What tiles are you using?

 

[bobby_la_mesma]

Thanks for your advice

I chose BAL because it happend to be on the web site I order my tiles from which are 200x300x7 cermamic. I spoke with the tech people in BAL and they managed to sell me the primer through my own inexperience