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Trying to rescue my bathroom wall, where the previous owners have skipped a few steps in the finish.

I belive the wall is made up of plaster and finished with glass felt* and painted, but some place have been repaired poorly.

My question is if I can just sand down the lumps, prime what is left and then paint?

Lumps on bathroom wall

*not sure if this is the right word in English, but it’s a type of lining paper made of glass fibers.

Edit: Putty changed to plaster