That’s interesting—old plaster really does seem to play by its own rules. I’ve had similar luck with paint sticking, but I always wonder if it’s just the years of grime giving it “tooth.” Ever tried painting over old wallpaper glue? Now that’s a nightmare. Do you ever seal patches with something like Gardz, or just stick to regular primer?
I’ve definitely wrestled with wallpaper glue—honestly, it’s one of those things that makes me question my life choices halfway through. If I even *suspect* there’s leftover glue, I always reach for Gardz. That stuff is like magic for sealing in weird residues and stopping bubbling or peeling later. Regular primer just doesn’t cut it for me on patched or previously papered walls; it seems to let the old glue bleed right through, especially if you’re using lighter paint colors.
Here’s my usual routine: scrape and wash as much glue off as possible (sometimes I use a vinegar solution), let it dry, then hit it with Gardz. Only after that do I bother with patching or priming. It adds an extra step, but honestly, it saves so much frustration down the line. The only time I skip Gardz is if I’m 100% sure the wall’s clean and never had wallpaper—rare in these old houses.
Funny thing, sometimes the grime and oddities of old plaster actually help paint stick better than a too-smooth modern wall... but yeah, glue is a whole different beast.
I hear you on the glue—last time, I thought I’d scraped everything, but nope, ended up with weird streaks under my paint. I’ve tried just priming and hoping for the best (not recommended), but Gardz has saved my sanity a few times. That stuff isn’t cheap though, so I usually do one “test patch” first to see if the wall really needs it. Sometimes a good vinegar scrub does the trick... but yeah, old wallpaper glue is sneaky stuff.
Gardz is a lifesaver, but yeah, the price stings. Ever tried using a steamer for the glue? I’ve had mixed results—sometimes it just makes a bigger mess. I’m always nervous about vinegar on old plaster though... have you noticed any issues with that?
I’m always nervous about vinegar on old plaster though... have you noticed any issues with that?
Honestly, I’ve used vinegar a couple times on ancient plaster and didn’t see any disasters, but I always dilute it way down—like, paranoid-level weak. Once, I got a little overconfident and let it sit too long, and the wall got a bit chalky. Nothing catastrophic, but enough to make me rethink my “natural is always better” mantra. Steamers are hit or miss for me too—sometimes it’s like melting the glue into a sticky soup. I guess there’s no perfect fix, just a lot of trial and error (and crossed fingers).
