Hi all sifus here

I am staying in condo. One of the bedroom wall paint are bubbling (not sure how this happen).
This bedroom wall are facing outside/external. There is no water services running on this wall.
The other bedroom wall facing the same outside/external don't have this issue.


So, i plan to repaint my unit bedroom, what treatment should i do on this wall before painting?
Apply acrylic wall sealer like Nippon 5170 will help? or any negative waterproofing that will help.

Any suggestions are welcomed.



This post has been edited by whitejack: May 18 2025, 07:33 PM