iBox sealing cuff - what to stick it on with?

[Weebles]

The sealing cuff that comes with the Hansgrohe iBox needs to be glued to the wall (a Hardie backer board).  Can I “glue” it on with my tanking paste? And then tanking paste over the top too? And is the tight fit (going to have to stretch it / cut it to fit over the unit) expected?

Thank you.

[PeterW]

Tanking paste under it, then use a squeegee or plastic scraper to press the cuff on. Then let it dry and add another coat on top. 

[Weebles]

Ta dah ?

 

thanks @PeterW

tiles arrive today so hopefully the tiler will arrive soon too.....