BURNING/ POOR ALKALI RESISTANCE:
DESCRIPTION

Color loss and overall deterioration of paint film on fresh masonry, concrete, or stucco.

POSSIBLE CAUSE

• Stucco and mortar joints contain hydrated or “hot” lime, a dry compound added to improve the
• workability of these materials. Different mortars are compounded with different amounts of “hot” lime, depending on the end use of the mortar. This problem is then made worse by more “hot” lime being added at the job site.
• The alkalinity of new mortar, cement mixes, and concrete is expressed numerically by pH readings.
• The pH of fresh materials is 13 to 14. It takes approximately 30 days for fresh materials to drop to an approximate pH of 9. A pH of 9 is less alkaline surface.
• Once these surfaces are cured, the introduction of moisture into these walls may reactivate the high pH
• Alkalinity, resulting in efflorescence, blistering, and peeling of the paint film.
• The alkalinity of “hot” surfaces will destroy and alkyd or oil product within 6 months. A vinyl acrylic coating will perform slightly better; however, it will ultimately fail. An acrylic coating will give the best service performance.

SOLUTION

• Remove all surface contamination (peeling paint, heavy chalk, efflorescence, laitance, concrete dust, etc,) by hand- or power-tool cleaning or washing with ProClean Professional Prep Wash Concentrated
• Cleaner or other appropriate cleaner, rinse thoroughly and allow to dry. All new surfaces must be cured according to the supplier’s recommendations ……. Usually about 30 days.
• Remove all form release and curing agents. If painting cannot wait 30 days, allow the surface to cure 7 days and prime the surface with Loxon Acrylic Masonry Primer. Cracks, voids, and other holes which allow moisture into the surface should be repaired with ConSeal Patch or Sealant or appropriate ProSelect Caulk. Rough surfaces can be filled using Loxon Surfacer to provide a smooth surface.

SYSTEM

INTERIOR

• Primer, if needed PrepRite Masonry Primer
• Filler, if needed Loxon Block Surfacer
• Finish Refer to our Interior Paint Rating Chart to determine which product best fits your needs.
• Suggested Finishes Cashmere, SuperPaint, ProClassic

EXTERIOR

• Primer, if needed Loxon Exterior Acrylic Masonry Primer, or Loxon Conditioner
• Filler, if needed Loxon Block Surfacer
• Finish Refer to our Exterior Paint Rating Chart to determine which product best fits your needs.
• Suggested Finishes Loxon Exterior Acrylic Masonry Paint, Duration, SuperPaint, A-100, WoodScapes.