| Charlie: I think I confused you by referring to the epoxy as a sealant. It was used as a primer, or base coat. The epoxy primer was applied on all interior pond surfaces and several inches into the pipes, but the pipes were open, not sealed. The polyurea was then sprayed. While there is debate about the stability of polyurea adherence to pvc pipe, there is a consensus that using an epoxy primer eliminates serious concern. The polyurea liner effectively becomes "one" with the pipes. An exception was the diffuser bottom drains. The central air line was covered to prevent polyurea being sprayed where the diffuser would attach. The drain line itself received the epoxy base coat and then was sprayed. |