You should let Sherwin-Williams know immediately as rhose dolts say...
Q: Do acrylic latex primers and topcoats "breathe" to allow moisture vapor
to pass through? Does this breathability diminish when a second topcoating
and subsequent repainting is done?
A:Studies have shown 50 gallons of water is vaporized into the air of an
average home each day from cooking, bathing, laundry and people. Much of
this moisture passes through the walls. If the exterior coating traps
moisture, blistering and peeling will occur.
Moisture vapor is more likely to pass through acrylic latex paint films than
through solvent alkyd types.
It's true that application of additional coatings will reduce moisture vapor
transmission, simply on the basis of increased film thickness. However, even
with several coats applied, the latex film will be adequately permeable to
water vapor and better than alkyd paint films of comparable thickness.
Note that water and water vapor are two different things. But both are
Latex/acryllic is slightly more permeable than alkyd; found that out
when we had our stucco/c.b. condo painted. Web sites for paint co. will
bear that out. FWIW, I don't recall seeing alkyd primer for new
drywall...all I can recall has been latex.
It's made. After my "experience" with paper applied directly to drywall, I
used a shellac based primer under latex. It "eggshelled" terribly. The BM
paint guy said that shellac was much too hard, making the surface too brittle
(for a moist location), causing the paint surface to crack. The fix was an
oil based primer and then another coat of paint. PITA, but worked
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