Anyone experienced Mapei Restoration screed pulling/gripping as it cures?

We have used Wunda boards to lay the UFH pipes into and the pipes seem to have risen during the curing process. The Mapei rep who came out said that it is such a ‘grippy’ product that it can pull as it cures and I’d be really grateful to know if anyone has experienced the screed pulling.Thanks

 

How deep did you apply the screed, also did you prime and what primer it’s a strong screed with high strength so can pull

 

We used all the products as advised / supplied by Wunda but this appears to be what has happened. The level specified was 5mm. I was hoping to get a feel from experts as to their experience with this product so thank you for your comment.

 

Which wunda system has been used

 

Rapid response

 

Does anyone else have a view please?

 

I've only really had this when I've done a deeper coat such as 30mm or so but mainly on an edge very fine causing light fractures.
Not had experience of it pulling when I do the usual 12mm over the ufh water pipes.