Leaking air conditioner damaged 6' X 6' section of a bedroom wall. After it dried out I scraped all the cracked paint and plaster. I then patched the section with mud and sanded down smooth. I primed the section with a water based primer with a roller. When I rolled the primer on it started to peel back the patch and the primer paint. Whats the problem here? Never had this happen before! Wrong primer? THere was humidity in the room so I thought maybe the paint was not drying correctly. Any ideas??

This also happened on a small section of the ceiling but there was no water damage in this section. However there was a hairline crack that I patched.
Thanks
Beer 4U2

 

Is there texture on the ceiling?

On the wall it sounds like not all the damaged plaster/joint compound was removed. The moisture in the latex primer may have softened up the failing paint/plaster and caused it to peel. You did remove the sanding dust, right?

When it comes to sealing stains, solvent based primers do a lot better job than latex primers.

 

Hi Marks

Yes I removed the dust and wiped it down with a damp sponge and waited for it to dry. As far as the compound, I was leveling out a wall that had been previously damaged by water. The plaster and old paint that was scraped off left an uneven wall surface that was smoothed out and patched with compound. I then sanded it down smooth. The patched surfaces remained. It looks like the paint peeled back the patched surfaces.

I have been told by a pro that I need to now primer the section with an oil based primer to seal it, then compund and sand over that, primer again with oil based primer then top coat. Will this solve the problem? Is it necessary to oil prime 2X or can I just compund and sand over the first coat of oil based primer and then top coat? It sounds like you are going in that direction.

The ceiling is not textured. Its a normal smooth ceiling.

I attached one of your links below. Should I use Zinnsers BIN (shellack based or is oil based suffcient?)

http://forum.doityourself.com/painti...ed-primer.html

Beer 4U2

 

So it's just the new j/c that is peeling?

Since the water in the latex primer is making it peel, using an oil base primer should help. I wouldn't think there would be a need for pigmented shellac.

Oil priming the wall prior to patching should stabilize the drywall. Oil primer after the j/c is finished might be over kill ..... but better safe than sorry