Depending on the aggressiveness of the sewage water and abrasion and erosion, concrete surface may exhibit premature degradation and abrasion that requires protection with protective coating like
Sikagard®-63 N or Sikalastic-8800.

In remediation works, particular attention shall be brought to the concrete surface humidity as with a too high humidity at the concrete surface may result in blistering problems or spalling on the protective coating.
To allow fast working process, the contractor may use a temporary moisture barrier like Sikagard®-720 EpoCem® prior to apply the protective coating.
This temporary moisture barrier provides as well some level of chemical protection enhancing the performance of the top protective coat.