Best lining for concrete retaining pit for Anodize Line

A. Hi Bryant. A trowel-on glass reinforced vinylester can be very robust, very corrosion resistant, and should introduce no new problems. Spray-on coatings are similar, but thinner, so not as robust. As for urethane liners, I understand their use and attraction, but don't really like them if they are ever walked on because they can introduce slip-and-falls.

If this "retainment pit" is secondary containment, i.e., is designed to be dry but capture an occasional spill (like the floor underneath the anodizing line), I think the vinylester trowel-on would be perfect.

But if this pit is a primary containment device (holding tank dumps, for example) you are not going to like the following answer because it makes a suggestion that is awfully expensive :-(

To understand the suggestion, you need to start from the premise that every liner will eventually crack or otherwise fail -- a premise that has been borne out in hundreds of old revamped or de-commissioned plating shops. I was involved in the complete revamp of only one very old plating shop that required no soil remediation, and that was because a liner existed in the gravel below the concrete. So that is my expensive suggestion. Good luck.

Regards,

A. I agree with Ted. The most robust liners are multilayer with a PVDF surfacing veil under the top layer. Basically, it is building a fiberglass tank inside your pit.