![]() Interestingly, the two NPC consultants have stated (conveniently at a different time or venue) that the worse thing you can do to a plaster surface is to maintain pool water with slightly aggressive water and etch it!īut how unfortunate for the service tech and pool owner (and convenient for the plastering consultant) if the gray discoloration isn’t removed by the acidic process because it will become difficult proving that it wasn’t aggressive water that caused the gray discoloration in the first place. But the most unfortunate point is that the plaster surface WILL BE ETCHED after the zero alkalinity process is performed. While the zero alkalinity process may occasionally lighten gray discolorations, it sometimes doesn’t work, or the gray color returns soon afterwards. If aggressive water is used to lighten gray mottling, how is it that slightly aggressive water caused white plaster to darken and turn gray, and in a blotchy, streaky, or spotting fashion in the first place?Īcidic treatments are an undesirable and improper suggestion for the service tech or pool owner to perform on a new plaster job. ![]() significantly aggressive water with a Saturation Index of -4.0). Dukes suggest that service techs perform a “zero alkalinity process” (a.k.a. Interestingly, to remove gray discolorations, Mr. Sadly, these incorrect claims enable pool plasterers to avoid responsibility for improper practices, and place blame on to innocent service techs or pool owners. There is no research study that supports their theory, not the Arch Study, the NPIRC studies, nor even references in the NPC Tech manual. NPC representatives, Greg Garrett and Randy Dukes, incorrectly claim that aggressive water or improper water chemistry startups causes the graying discoloration (NPC Jan-Feb 2004 & Fall 2007 newsletter, Techlines 7 th Edition). Usually, this type of staining can be easily and safely removed from the surface by acid washing, sanding, using sequestering or chelating chemicals, or other stain removal products.įor this article, we are discussing a blotchy or streaky gray discoloration that develops during the first few months, a discoloration that is difficult to remove, and is often incorrectly termed as a “hydration problem” or “entrapped moisture.” This type of dark discoloration should not be confused with metal or mineral staining. Gray (also spelled “grey”) or darkened blotchy discoloration of cement flatwork is known to be caused by several improper practices, including the addition of calcium chloride to the mix (even less than 2%), late hard troweling, and sometimes a cement material issue can lead to this problem (Concrete Slab Surface Defects: Causes, Prevention, Repair Portland Cement Association 2001).Īlthough some discolorations are the result of metals precipitating and depositing various color residues onto the plaster surface, these are referred to as surface staining. Gray mottling discolorations occasionally occur in new white plaster swimming pools, and cause of this plaster defect is being incorrectly assigned. For flexibility, E-Z Patch 24 can be applied prior to repairs.Posted by Kim Skinner on Septemat 11:08am Then, after fill-in is dry, dampen with water and finish the repair. First, fill-in with E-Z Patch 1, 5, 6, 7, 9, 10 or 11 until the depth is 3/8 inch. ![]() HINTS:To prevent surface shrinkage cracks in repairs over 3/4 inches deep, use a 2-step process. To match Classic Pebble Colors, wet existing surface to compare pictures. All of the EZ-Patch cement repair colors may be adjusted using any cement dye. E-Z Patch special color matched products, instructions and How To Videos will make it happen. Now, repair and patch the most common pebble surfaces like a pro. If water is lowered to do repairs, the pool may be refilled after 4 hours. This product contains special modified materials with pozzolans (siliceous volcanic ash) and polymers. It is also the best product to use for fast repairs in cold temperatures. The 1 pound jar of E-Z Patch 9 Fast Set Pebble Plaster Repair is specifically designed for fast underwater and is available in Classic and Stonescapes colors, regular size pebbles.
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