Wall prep on painted plasterboard

[Stavs tiles]

Hi guys!

I've had mix reviews on this one and need a final judgement by you helpful lot!

So I've got a plasterboard that's painted with emulsion and going to tile onto.

Wall prep.........The question is shall I score/scratch the plasterboard with a sharp tool so the adhesive can grab onto. I will be priming the wall with Acrylic bal after.

A lot of people are telling me just to scrape and key the painted plasterboard and it will be fine?!??!?

A lot of people are also telling me il weaken the plasterboard. These tiles are 300x550 and ceramic and actually not too heavy.

Thank you all so much in advance!

 

[widler]

Don't scratch the board with a knife, if it's just emulsion, sand it down with sand paper and prime it as normal.
Or you could scrub it with a sponge and rub it off, but I don't like wetting the board to much as it could lift the paper

 

[Andy Allen]

As above ...sand it , primer it......jobs a good -un...

 

[Stavs tiles]

Cheers lads, do I need to remove all the paint as that may be a nightmare?! Also what would happen if I keyed the plasterboard a bit?

Just wana get the tiles nicely secured on the wall so they don't fall off!

 

[widler]

If it was skimmed you could scratch it, but because it's just board it weakens the board , the paper is what holds the gypsum together mostly .
.and no,just get as much paint sanded as best you can, your primer with soak through the emulsion

 

[Andy Allen]

It really ain't that hard . ...rough grit sand paper, block of wood to wrap it round . ...do a whole wall in 30 mins . .
Even easier if you got a palm sander.
You don't need to be to anal about it....long as you get most of it off ..

 

[Stavs tiles]

Thanks guys much appreciated!