Substraight advice for splashback

[Anthony Wills]

Ok, strange one. My customer was advised to chalk his walls. He has removed the old tiles and adhesive in the kitchen which, luckily, has left the walls in a fairly straight condition. But he had bought tubes of chalk and kind of applied it like you would with plaster to the whole wall. I have just used an aycrlic primer diluted 1:1 as per instructions, but this has weakened the chalk meaning I can basically scrape it of with my fingers. Any advice please? Using bal green star, 150 x 150 ceramic (cheap) tiles. Thank you

 

[macten]

I'd be scraping it all off.
Sounds like it will come off easy enough.

 

[Time's Ran Out]

Yes scrape it all off and reprime the bare plaster.

 

[acaciaguy]

As above. Good advice

 

[Anthony Wills]

Tried to get it off but it's left the substraight in a pretty crap state. No plaster in places. So I either try and scrape of all the plaster, cut out the plaster board and reboard or overboard with 3mm? Backer board.

 

[Anthony Wills]

Or is 6mm the smallest?

 

[Dumbo]

4mm is pretty easy to get hold of

 

[Anthony Wills]

Update: the customer has spoken to his Dad, who gave the chalking advice. His Dad is a painter and decorator and has now said, "just PVA it, then when it's dry you can tile it, that's what i did in my bathroom" I've explained that you don't use PVA for tiling.

It turns out the rest of the chalk came of easy, so I'm going to re-skim one area, then tile when it's gone off....using acrylic primer of course