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Sealing Painted Concrete Wall

In the basement a previous owner had simply glued paneling to the concrete wall in the laundry room. Recently it started to smell moldy so I pulled down the paneling. The wall is painted and I would like to seal it before putting up new drywall/paneling.

How do I seal the concrete that is already painted? Once I get the wall sealed, what is the proper way to put up the new wall?

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