My 1st Job Tiling over kitchen grease - Tile Advice

[doctorjames]

Hi all,

I'm just about to start tiling my small kitchen.

I'll be tiling over painted plaster, and while the plaster is sound, in one area the grease from a hob has permeated through the paint. Even after scraping off much of the paint the underlying plaster has a "wet look" in this area from the grease.

Do I need to do anything special to deal with this? I was thinking of scoring into the plaster to provide a keyed surface for the tile adhesive.

Many thanks,
James

 

[Time's Ran Out]

Mechanically sand the whole area to get rid of the paint completely.
And don't worry - your a Doctor!

 

[Blunt Tool]

Once sanded prime with an SBR primer then away you go

 

[doctorjames]

Mechanically sand the whole area to get rid of the paint completely.

Thanks for that. Shouldn't be a problem with some 40 grit sandpaper and an orbital sander.

Once sanded prime with an SBR primer then away you go

SBR primer looks good — should stop the old plaster instantly sucking all the moisture out of the adhesive too. My 1990s DIY manual didn't mention primer.

And don't worry - your a Doctor!

Haha. Yeah, at least I can write a nice report about what went wrong afterwards.…

 

[doctorjames]

I checked the ready-mixed tile adhesive I'd already bought from Toolstation:
EverBuild 701 Non Slip Tile Adhesive:

Non Slip Tile Adhesive is an acrylic based formula for extra slip resistance and grab. Designed for general use in bathroom and kitchen areas. May be used in domestic showers when used in conjunction with Everbuild Powdered Wall Tile Grout. Tested to EN12004 type D1T.

The Technical Data Sheet states:

New plaster must be a minimum of 4 weeks old before tiling. Tile onto finishing coat only. Prime with EVERBUILD PVA diluted 1:3 with water.

I thought PVA was a big no-no from reading this forum!

Is this just their advice for the kind of noddy DIYer that buys ready-mixed tile adhesive, or is PVA actually better suited to their acrylic based adhesive, since they actually recommend it?

 

[Bond]

Personally would not use PVA, then l am not the manufacturer.
However if it's a dry area,( not subject to moisture) then l suppose it theory it will be okay. ( still wouldn't use it though).

 

[doctorjames]

However if it's a dry area,( not subject to moisture) then l suppose it theory it will be okay. ( still wouldn't use it though).

It's a kitchen and so there will be water splashed around by the sink, steam from a kettle, pans boiling, etc. — it's why I picked the adhesive in the first place as it claimed to be suited to wet areas.

I'm inclined to use a proper primer. Does the adhesive being acrylic-based rather than cement-based have any impact I should be aware of when choosing a proper primer?

Would this Mapei Primer from Toolstation do?

Ready to use water based primer for all porous backgrounds. Used for treating surfaces prior to installing tiles using cement based adhesives. Reduces surface porosity, increases adhesive open time and improves bond strength.

 

[Bond]

It's a kitchen and so there will be water splashed around by the sink, steam from a kettle, pans boiling, etc. — it's why I picked the adhesive in the first place as it claimed to be suited to wet areas.

I'm inclined to use a proper primer. Does the adhesive being acrylic-based rather than cement-based have any impact I should be aware of when choosing a proper primer?

Would this Mapei Primer from Toolstation do?

Seems the above primer is for use with cement based adhesives.
Personally l would go with SBR.

 

[doctorjames]

SBR it is. Many thanks for the advice.

 

[WetSaw]

Yeah, at least I can write a nice report about what went wrong afterwards.…

You might want to type it, you know what doctor's handwriting is like!

 

[doctorjames]

You might want to type it, you know what doctor's handwriting is like!

Too true!