8/25/2023 0 Comments Pool plaster repair wetmay also display this non-removable deterioration. Disturbed zones along accent or surface tile, around fittings, etc. Beginning as excess porosity around the disturbed aggregate, soft spots expand and sometimes coalesce into larger affected areas. This late hard troweling disturbs surface aggregate, and added water penetrates around that aggregate and spreads laterally through the porous paste caused by accelerated shrinkage. White Spotting and Streaking Deteriorations– Plaster may eventually develop white (lighter color) porous (soft) spots and streaks resulting from the addition of water to the hardened surface during late hard troweling in plaster containing excessive calcium chloride. Severe mottled color variation from calcium chloride or finishing issues may occur quickly or take several months to show up. Late hard troweling can cause “trowel burn” which darkens the plaster color in localized areas. Gray (or grey) mottled discoloration (also known as “water entrapment ” or “hydration”) is difficult to remove, may be remedied by acid washing, sanding, or torching the surface, but these processes are generally detrimental to a plaster finish and the discoloration often returns later. Identifying Plastering Defects on New Pool Plasterĭiscolorations – New pool plaster can discolor (darken or turn gray) from adding excessive calcium chloride set accelerator, from late hard troweling, from thin and thick areas due to an uneven shell, etc. Reprinted with permission from Kim Skinner of On Balance: Identifying Plastering Defects on New Pool Plaster June 23, 2011
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