What to do about uneven (bumpy) ceiling before painting?

vlane

New member
Ceiling is thin fiber wood with 1.8 x 1.2 frames only a few mm thick. It was previously wallpapered now tacked up with gimp pins to do something about the sagging. For an easy way out what about putting some thin rigid material in the sections like stiff cardboard or that stuff they use in real estate signs and paint onto that, or ...?
 
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