Pool has been under construction. Following plaster completion as fill started I noticed what looked like potential cracks. Was assured not an issue and any discoloration, appearance of imperfections would go away over a period of a few months. Today, service guys were out and mentioned something so raised to the project manager again. Response was "hairline cracks are normal," which seemed like an odd response to me. Attaching picture and would appreciate any thoughts for those that have experience in this arena. Plaster is Diamond Brite Watercolor series.