A plaster wall in an old closet has stains coming through the paint. I don't know what the stain-causing stuff is, but it seems to be under the entire wall of the closet. It is showing up in mottled patches all over the wall. The existing paint is very old.
We covered it with Kilz oil-based, white-pigmented, primer. The stain came though the first coat by the next day. We applied a second coat of Kilz and it held up well. We left it there a few weeks to make sure.
Then, we painted the closet with a latex paint. In two days, the stain is showing though the latex.
- Can the latex pull stain through the primer?
- would another coat of primer and paint help, or should I replace (or cover) the wall with drywall?
- Is there some super-primer I should use instead?