drywall repairs

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I have read many books on the subject of drywallin,however, I still can't
find the answer to a drywall question I am dealing with in my newly
purchased home.

The previous owner renovated the house himself and did the worst drywall
installation, taping, sanding - everything. It torments me everyday to look
at the sad walls. I have tape that I could probably just pull off the wall
and corner beads are plainly evident everywhere (and are capable of
scratching you). My resolution to this is to just re-tape, re-sand (I don't
think the original was ever sanded anyway) and re-paint the mistakes. One
problem, though, the interior has been painted many times. If I remove the
tape, secure the loose drywall to the studs and re-tape, will the joint
compound stick to the paint? If so, I'm thrilled, but if not, somebody
please advise?