Thanks for the info. I might try sanding/scraping first, since I have zero experience putting up new drywall, and this would be a complicated job. 2 doorframes (entry door + closet door), a tub, a shower, a large vanity, and two windows. Lots of tiny spaces in-between the frames and the corners of the room (meaning 2-3" strips of drywall between the frame and the corner of the room).
At the moment this project is on an indefinite hold, since I still have plenty of stuff elsewhere in the house to paint.
I think this room will be last on the list.
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I would wet it down and hope it scrapes off. You could also try peeling it, you are praying for poor to no prep work from the original painters.
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Wouldn't surprise me in the slightest. I've pulled off some of the original paint in the house (all the way down to the drywall, as best I can tell) by pulling up painter's tape while painting other rooms. I'm assuming they didn't use any kind of primer.
Cheap mid-90s construction.
Damn house isn't even 100% square, either…probably framed by 15-year old illegal Mexicans.