Prepping for backerboard

Hi folks,

ive been having great fun clearing off a bathroom wall.

I want to stick some backerboard up. The walls are still dusty (it was gypsum) as hell despite multiple brushdowns and some spraying.

as it stands will the backerboard stick? If not, any tips for further wall prep?

cheers

 

by 'backerboard' do you mean hardiebacker/cement board? You can't dot n dab that.

 

Cheers, it’s “Qboard” BandQ sell the stuff. Manufacturers say to dnd and fix with anchors. It’s up and it’s sticking anyway!