I had some mould (due to condensation) on bedroom wallpaper so I have removed all the wallpapers. I am planning to paint the wall with Ronseal Anti-Mould Paint instead of using wallpapers. Also, bought a dehumidifier to fix the condensation issue.
Ronseal website suggests I need to seal the plaster before using the Anti Mould Paint for a newly prepared plaster. In my case, there were wallpapers on the wall so I think it still applies to me.
Can you please suggest how to seal plaster? If you can suggest any available products then it would be very useful.
Below is the photo of my wall after I removed all wallpapers.