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Old and new drywall

3.1K views 5 replies 6 participants last post by  Lakhi Taping Co.  
#1 ·
Need some help. Im going to finish this drywall and i was wondering if something needed to be done first because its old drywall against new drywall. Will i have trouble with the mud adhering to old painted wall. Thanks for any help. Also what would be the best mud to use.
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