Painted Plaster

[RDTiling]

Hi all.

It's been a while since I've posted due to 2016 being a very slow year, however things are starting to pick up now. It got to a point in March where I considered shutting up shop, but I'm glad a persevered with it.

It's been a while since I've had a job with painted plaster (only on one wall). I put about 12 pieces do duct tape on various bits of the paint, left them about 4 hours and upon peeling them off the paint remained firmly on the wall.

I had thought about going down the sanding route, which I will if necessary.

As a bit of brainstorm, does anyone foresee any stumbling point if I were to:

1. Score the wall with a Stanley blade
2. Prime wall with Acrylic Primer
3. Roller on an SBR Slurry coat and then tile onto slurry coat

Unfortauntely, I can't dot n dab the wall, as if I did this - and after tiling, it would cover the oak window sill they have just had fitted (as part of the new window being installed). The joiner has only left about 15mm of window sill overhanging the wall.

Any thoughts, suggestions are welcome.

Rich

 

[White Room]

Is it a plasterboard wall or solid plaster, what tiles are you fixing.

 

[RDTiling]

Is it a plasterboard wall or solid plaster, what tiles are you fixing.

It's a solid plaster wall onto the brick. I'm fixing 60 X 30 porcelain, so I'm concious of weight limits.

Tile are from CTD - the Azulev Pearla range.

The two internal walls are plasterboard onto stud frames - unfortuantely this is an external wall.

 

[Ian]

As @whitebeam has asked, what tiles are you fitting?

 

[Ian]

Sorry, we replied at the same time. A wallpaper steamer is a good way of removing paint.

 

[RDTiling]

Sorry, we replied at the same time. A wallpaper steamer is a good way of removing paint.

I did think that could be a good way to go, but was trying to add extra grab and weight tolerance by possibly applying the slurry coat, assuming I get it to the right consistency to roller onto a wall!

 

[White Room]

I did think that could be a good way to go, but was trying to add extra grab and weight tolerance by possibly applying the slurry coat, assuming I get it to the right consistency to roller onto a wall!

That won't make a blind bit of difference adding a slurry, if the paint/plaster has a weakness it's just adding weight to the surface.

 

[One Day]

Quickest way (but costs and will add 4-6mm depth) bond 4mm wedi board to the painted wall and supplement the bond with mechanical fasteners. That will take plenty of weight and you'll be able to sleep at night.

 

[Flintstone]

I seem to come across this about once a month, I check its adhesion like you have, if it's thick bathroom type paint or v old paint then I try and remove it all, if it's just a seal coat of white emultion onto new plaster then I just score it and prime it a couple of times then tile it. I have tried pulling a tile off once set and there is zero chance.

 

[On one]

I seem to come across this about once a month, I check its adhesion like you have, if it's thick bathroom type paint or v old paint then I try and remove it all, if it's just a seal coat of white emultion onto new plaster then I just score it and prime it a couple of times then tile it. I have tried pulling a tile off once set and there is zero chance.

Hi Localtiler
As for your technique for new paint on new plaster..........skim some tubbed adhesive onto the new emulsion paint........go to the van for a cuppa........bring back a Gundlach scraper with you, scrape the adhesive off and the paint comes with it, leaving a spotlessly clean wall.
20 minutes, that's all the time that it takes for the moisture in the adhesive to affect the adhesion of the paint.

 

[Flintstone]

I don't use ready mixed adhesive so I wouldn't know about that. What I do know is, if Done as I said for prep and use powdered adhesive, the next day you cannot pull the tile off the wall.

 

[Stef]

Don't ever tile on top of paint on a plastered wall, if it's a **** coat then it probably won't come off but any more layers then it must be removed.
Don't just score the surface to get a key as its only minimal contact, remove as much paint as possible & you will be good to go.

 

[On one]

Hi Localtiler.
The use of tubbed adhesive(because it is cheap) to remove the paint is a tried and tested method of removing new paint on new plaster,but powdered adhesive has the same desired effect........ie paint will affected by moisture.....be it whether it has a tile placed on it or not.
As for not being able to pull the tile off a wall the next day.......I have been able to take a tile fixed with RS onto a plastered wall the next day quite easily.......even RS doesn't cure fully for 4 weeks.

PS Not meant to come across as short or curt(as is sometimes possible on the internet)

 

[Flintstone]

I agree it is always best to get the paint off! I wouldn't tile on any layers of paint or any bathroom paint or anything like that. Only a sealing coat of thin white emulsion.

 

[WetSaw]

The trouble with painted surfaces is you never know if it's going to hold or not...

 

[RDTiling]

Thank you for all your replies.

I'm going at this one tomorrow and have managed to borrow a steamer so will five that a go first.

There are probably a couple of layers of paint and it certainly isn't onto new plaster.

It's a pity the wall is painted as putting my big spirit level on it, it is very plumb, with no gaps between the wall and the spirit level.