We had to do some repairs to some walls, putting up a few sheets of new drywall. We used Durabond setting type drywall compound, both all-purpose and then lightweight. We used Conco PVA primer/sealer and Pittsburg latex paint sprayed on with an airless painter. A few hours after painting we went back and found several spots where the setting type lightweight compound turned soft and bubbling up, but only over the old, smoke-covered walls, not over any of the fresh drywall. We also found a spot where no work had been done, but it is bubbling up too. We have more painting to do and don't want the same problems. Any ideas on what happened and how to prevent it? Thanks.
-- Mike D.
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