Mapei primer G skinned over | Tilers Forums (2025)

Discuss Mapei primer G skinned over in the DIY Tiling Forum area at TilersForums.com.

H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 24, 2019
  • #1of12

Hi,
I've previously posted in this forum about my first failed tiling attempt. I was able to take up the tiles easily after they'd set and someone suggested my primer may have skinned over.

Since then I've taken up all the adhesive and primer and have primed again with mapei primer g 1:1 and it has skinned over as you can see from my picture. You can also see that it looks like there are two different types of material on the floor. The material closer to me is slightly higher than the material that the primer is peeling off. I don't have a clue what the screed is and am wondering if that might be my problem.

My intention is to level the floor with mapei ultraplan self leveler.

Mapei primer G skinned over | Tilers Forums (1)

Dan

Admin

Staff member

5,100
1,323
Staffordshire, UK
  • Oct 25, 2019
  • #2of12

You seem to have some backing from some underlay or chord carpet there.

Have you rang Mapei Tech line to speak to somebody there? - They're awesome guys. Mention Dan sent you from the forum and they'll help you out as best they can.

Sounds like you might need to mechanically move whatever it is that's on your floor. Get right back to the actual surface to tile to.

You can use sanders and grinders and perhaps even a SDS to hammer away at it, create some scores for the primer to adhere into.

That all said, I'm not a tiler. So speak to Mapei for me. Mapei primer G skinned over | Tilers Forums (3)

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Dave

TF

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Co.Durham
  • Oct 26, 2019
  • #3of12

Your ratio is too strong. It wants to be 4:1(water to primer).
An orbital sander with 60 grit will help remove any crap on the floor.

Dave

TF

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  • Oct 26, 2019
  • #5of12

Hoot37 said:

Thank you both. Do you think this may be an anhydrite screed?

is it a pourable screed ?
Is it heated ?
Sand a section of screed and tell us what colour it is.

H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 26, 2019
  • #6of12

Not sure if pourable. It's been down since the house was built 12 years ago. It's not heated.
Ive just sanded a patch and it's a white /light grey and is rough after sanding.
I'm going to sand the whole floor back today.

Dave

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Co.Durham
  • Oct 26, 2019
  • #7of12

If its grey , then it isnt anhydrite , make sure you water the primer down more and it’s won’t skin.

H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 26, 2019
  • #8of12

Dave said:

If its grey , then it isnt anhydrite , make sure you water the primer down more and it’s won’t skin.

Excellent, thank you! I'll be sure to post an update.

H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 26, 2019
  • #9of12

So I've spent over an hour sanding the floor back. Would I only need one application of the primer 4:1 or would it need multiple applications?

H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 26, 2019
  • #10of12

I've made 3 applications of the primer mixed 4:1 I haven't applied it very thick, just enough so I can see the floor is wet where I've applied it.
Should I leave it there or apply more? I'm not sure how much is enough and I don't want it to skin over again.

Wayne Brown

TF

Esteemed

Arms

213
558
Norfolk
  • Oct 26, 2019
  • #11of12

More than enough I would say directions posted below .

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H

Hoot37

DIY Tiler

1
38
Bridgend
  • Oct 27, 2019
  • #12of12

Thank you for everyone who's helped me so far. Just an update for you. I've just poured my self leveling compound. The majority of the floor has about 4mm, but as you can see there are a few high spots where obviously the level is below the minimum of 3mm recommended by mapei. Shouldn't matter though should it? Because its only in a few small patches.

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