Loss of adhesion from plaster that can occur in spots or larger areas.
POSSIBLE CAUSE
Peeling from plaster could be a result of insufficient wet
troweling of the white coat when the plaster was originally applied,
causing chalking of the surface.
Very hard plaster may be very click, reducing the adhesion of any coating.
New plaster might have a high pH, requiring a primer resistant to alkalinity.
Old plaster that has become powdery.
Poor surface preparation.
SOLUTION
Bare plaster must be cured and hard. Textured, soft,
porous, or powdery plaster should be treated with a solution of 1 pint
household vinegar to 1 gallon of water. Repeat until the surface is
hard; rinse with clear water and allow to dry. All new plaster should
be primed after it has been cured a minimum of 30 days. If painting
cannot wait 30 days, allow the surface to cure 7 days and prime with
PrepRite* Masonry Primer.
If peeling has already occurred,
remove as much of the coating as possible by sanding or scraping before
repainting. Test the coating surrounding any peeled areas out about 6”
to12” to be sure the adhesion is adequate.
Cracks and holes
in plaster should be repaired before repainting. Make sure the newly
repaired plaster is similar in surface texture to the adjacent plaster
so that the repaired area blends in with the original area.
Follow label and data page information for proper surface preparation and application.
SYSTEM
INTERIOR
Primer, if needed PreRite* Wall & Wood Oil Primer/Undercoated or PrepRite
Masonry Primer or prepRite8Classic Primer
Finish Refer to our Interior Paint Chart to determine
