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acheist

04:52AM | 06/16/08
Member Since: 06/15/08
3 lifetime posts
Bvmisc
I have a 30 year old house with a concrete block first floor (no basement). I believe the block was originally plastered, and then painted about ten years ago. The ten-year old paint was peeling, and there was some effloressence underneath the paint, so I had painters wire brush the loose paint off. The foundation was then powerwashed, patched with plaster where the old paint chipped off, and then painted a week ago with masonry paint. It appears that the new paint didn't bond to the underlying surface in some areas. (There are areas that look almost like they have bubbled up. I can push them in with my finger and leave a mark.) My questions: how SHOULD this problem have been fixed (obviously this wasn't the right way) and what can be done now to fix it? My painting contractor is coming back tomorrow to discuss. Is the only way to fix to apply a mesh and re-plaster? or re-stucco? (not sure what the difference is.) Also, the paint was applied on a very hot, humid day--does that matter? Thanks!

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5slb6

02:42AM | 06/17/08
Member Since: 07/28/02
1356 lifetime posts
Was the efforessence treated with a mild acid wash?

Did you use a masonry primer designed for high alkalinity?

Yes if you paint in direct sunlight that can cause adhesion problems.

Was the paint a 100% acrylic paint, which would do much better on this type of surface but you still needed the masonry primer.

They may be able to get the new paint off with a power washer if it is only a week old and start over.

acheist

03:47AM | 06/17/08
Member Since: 06/15/08
3 lifetime posts
Thanks for your response. No, there was no acid wash and no primer. (There was still some old paint on the block after they pressure washed and I believe this is where the new paint isn't adhering.)

If all this paint has to come off (and pressure washing doesn't work) is peel away the best method? Or should the whole mess re-stuccoed? nightmare....

but thanks for your help!

5slb6

04:42AM | 06/18/08
Member Since: 07/28/02
1356 lifetime posts
If it is the old paint that is peeling then all of the paint needs to come off and that is even if you stucco again as that will be on top of the failing paint. Yes peel away will work on this.

acheist

05:03AM | 06/18/08
Member Since: 06/15/08
3 lifetime posts
Peel Away it is. I'll post on how it worked. Thanks a lot for your help.
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