I have some 12mm mdf panels 380mm x 515mm that I want to fix to a painted plasterboard wall, I would like no visible screw holes. I have initially tried simply using "no-nails" a fairly aggressive adhesive we have over here in the UK, but after a week or so, the panels fall off. It appears the adhesive is taking the paint off the plasterboard wall.
Stripping the area of paint seems the obvious approach. My question is: should I seal it with PVA before applying the no-nails with the associated board?