Water Treatment Works Tank Repairs and Epoxy Coating - Nottingham These wastewater tanks were no longer holding water and needed complete refurbishment. The overall condition of the concrete was good, apart from settlement cracks at the internal corners and the expansion joints needing re sealing. After preparatory sandblasting we carried out the necessary concrete repairs and mastic sealing using Sika products. We were lucky with this project, we had great weather for the whole week. Perfect conditions for applying our specialist epoxy coating system.