Painting - Peeling Paint
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shellib
04-01-04, 06:27 AM
I have read a little about paint called calcimide or calcimide, or paint that contains this. Can anyone tell me how to tell if I am dealing with this?
Shelli
Shelli
prowallguy
04-01-04, 07:05 AM
Calcimine (also "kalsomine") is a white or tinted wash applied to interior plaster surfaces. It was supplied as a dry powder mix of calcium carbonate (chalk) and glue (usually casein), and the painters mixed water with it to prepare it for application.
Your title says 'peeling paint'. What is the problem? Was your paint job, or the underlying layer, done about 50 years ago? On plaster? Is it real chalky?
Your title says 'peeling paint'. What is the problem? Was your paint job, or the underlying layer, done about 50 years ago? On plaster? Is it real chalky?
shellib
04-01-04, 07:25 AM
Our house is almost 100 years old. In my little hallway, the paint on the ceiling looks like it is alligator-ing, and peeling. It is chalky underneath. But I can peel chunks of the paint off. I have not had any problem in any other room in the house. Does this need special prep to paint over?
shellib
04-01-04, 07:26 AM
Sorry, I forgot to add the walls ARE plaster.
prowallguy
04-01-04, 07:42 AM
Allrighty, since calcimine was way before my time, I've only seen it once. So I'm going to mug some advice from the Paint Quality Institute.
Q. I was told by the seller of my 1929 colonial home, that the plaster walls in the house were painted with calcimine paint (horsehide glue and pigment) to at once seal and color the walls. The problem is, that even after oil based primer, latex paint will not remain on the walls for more than 2 years before peeling off in large pieces. Any suggestions for a cure?
A. If the latex paint AND the alkyd primer are peeling off together, then the calcimine is probably the cause of the problem. One way I've heard to recoat calcimine, is to use a solvent based masonry conditioner reduced with mineral spirits as your first coat. This is a very thin material that can penetrate the surface, much like it does on a chalky surface on the exterior of a house. You can then topcoat with a latex or alkyd topcoat Another possible cause of the peeling, considering the age of the home, is the lack of insulation and vapor barrier in the wall structure. The peeling could be caused by excessive moisture in the walls.
I have also heard that a penetrating alkyd primer will do just as well as the solvent masonry conditioner described above.
And after more searching, it appears that Benjamin Moore has a product for this: (you must have Acrobat to read this)
Calcimine Recoater (http://www.benjaminmoore.com/tds/1033/TDS306B.pdf)
Q. I was told by the seller of my 1929 colonial home, that the plaster walls in the house were painted with calcimine paint (horsehide glue and pigment) to at once seal and color the walls. The problem is, that even after oil based primer, latex paint will not remain on the walls for more than 2 years before peeling off in large pieces. Any suggestions for a cure?
A. If the latex paint AND the alkyd primer are peeling off together, then the calcimine is probably the cause of the problem. One way I've heard to recoat calcimine, is to use a solvent based masonry conditioner reduced with mineral spirits as your first coat. This is a very thin material that can penetrate the surface, much like it does on a chalky surface on the exterior of a house. You can then topcoat with a latex or alkyd topcoat Another possible cause of the peeling, considering the age of the home, is the lack of insulation and vapor barrier in the wall structure. The peeling could be caused by excessive moisture in the walls.
I have also heard that a penetrating alkyd primer will do just as well as the solvent masonry conditioner described above.
And after more searching, it appears that Benjamin Moore has a product for this: (you must have Acrobat to read this)
Calcimine Recoater (http://www.benjaminmoore.com/tds/1033/TDS306B.pdf)