About to start some drywall repairs where the compound needs to be feathered out for a ways over the adjacent semi-gloss painted surface. I’m worried about it adhering to the painted surface sufficiently, and was thinking of doing a light sanding of the surrounding paint followed up by a wipe down with some TSP before applying the compound. Is there any other tricks out there or am I worrying for nothing?
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Sounds like you've got it down pat. I'm not sure I'd even bother with the tsp, but the light sanding will help; and if there's any texture on the wall, the sanding will keep your fill from picking up the ridges.
I can't remember drywall mud NOT sticking to anything I've put it on (or spattered it on), even glass.
but mud does tend to bubble up over paint, and those pinholes drive me nuts. Coating the area with drywall conditioner an hour ahead of time helps keep me sane.
"The child is grown / The dream is gone / And I have become / Comfortably numb " lyrics by Roger Waters
If the wall was already painted then you might want to consider your paintiing of the patch. Take a sponge , any kind, dip it in the paint and dab it on the wall. This will give the patch a textured look. Sometimes when you look down a wall you can see smooth spots on it. This is because painted surfaces develope a texture over time and to patch it you sometimes get the " new sheetrock" look to it. You dont need the faux sponges a kitchen sponge will work just dab it until its evenly spaced and there are no gobs of paint or smooth spots
good luck
Just use USG joint compound . [not lite weight ] Or you can use durabond , but not easy sand . The wall needs to be clean from grease or oil.
Tim Mooney