Gluing down Korlok LVT planks to concrete

[SB2023]

Hi all

I know this is not recommended, but its how we plan to solve our small stair issue...

 

Can anyone recommend the best glue that would work between the foam back on korlok LVT planks (they are the floating floor, not glue down ones) to bond it to concrete? There is too much choice out there and all the best recommendations are USA based products like loctite P300 foamboard or Shaw T180.

 

Background: Our staircase is a concrete staircase (I have primed it, so I dont think water based adhesives will work). Plans were for wood floors but last minute changes and new screed heights mean this is not possible. I am routing the backs of the plank so I can fold an internal mitre type joint in it - have done a few trials and works well, plus miles cheaper than buying ready made ones (that dont actually exist in our floortype).

 

Appreciate any input.