GZA was called in six months after a sealant installation to determine why the elastomeric sealant in a large exterior reflecting pool was only partially cured. Upon inspection, it was found that the pool was cured in only half the installation while the remaining portion was not cured and depolymerized. GZA investigated the history of the installation, finding that the cured half of the pool was placed in July, while the uncured half was placed during a cold spell in November. All material was from same manufacturer and the same batch. GZA determined the pool had been acid etched as a paint preparation within two days after sealant had been installed. The acid etching before the sealant cured prevented and reversed any initial cure. The pool was installed without consulting the sealant contractor or manufacturer. The painting contractor paid for all damages and repairs.