The corner bead around one of the windows in a bathroom is showing rust
through the wallpaper. I guess it was put in when the house was built
back in the early 1980's. Should I replace the bead to prevent rust
from progressing & staining the new wallpaper/paint or can I just paint
over it with some rust preventing paint?
You need to find out why it is rusting is the primary thing.
First thought, especially being around a window, is that moisture is
getting in there from the outside. If it is coming from outside, what
effect has the moisture had on from where it is entering till it reached
the corner bead?
I don't know how you would get to the corner bead to effect a
repair without losing the paint, texture, compound, and existing
corner bead. It must be getting wet from somewhere and once rust
has started . . .
If you decide to tear the area apart, they do make MR drywall
(moisture resistant - green board) and Trim Tex makes excellent
corner bead and drywall trim that is totally plastic. I would use
thermal setting compound to reduce the disintegration factor.
Keep the whole world singing . . . .
DanG (remove the sevens)
I have a corner bead, right at the entry to our shower, that rusted
quite deeply - all along the flange at the bottom. After grinding off
rust, putting on Rustoleum primer, it continued to rust through the
patching compound. I finally dug it out again and cut off the section
that was worst rusted, primed what I could reach, "walled off" the
deeper edge with silicone caulk, let that cure well, and then patched
and painted. About a year and a half, and it is holding. The problem
was that the tile baseboard took a very minute dip by the corner bead
and would hold water. Fixed that, too, by building up the grout a
little bit. After I put up new wallpaper, I taped the bottom edges and
sides of paper (next to shower stall) with a fine line of grout to keep
steam from loosening the paper.
If just the corner has a touch of rust, I would sand off the rust, use
rust primer right away, let it cure very well. Be sure the room is very
dry when you work on the bead.
The corner bead is embedded under the patching compound. I don't know
how moisture got to it, unless it just permeated the wall slowly over
the years. I'm sanding down the metal bead to get all rust off. It
isn't consumed with rust, but just enough for rust stains to be showing
along the outside corner...enough to stain the wallpaper.
So I'm going to prime the exposed bead and patch over it. Any better
I may be able to use tape, or maybe place a new vinyl bead over it to
get a clean-shaped edge.
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