Did a before-after shoot on the liner work this year. I believe this will be the last time it needs re-surfaced prior to startup for at least a few years. The sump was finished with Pondshield® leftover from last season two weeks ago. As expected, it was quite time-consuming and difficult getting things ready to coat. the main issue this time was old, dried-up algae that grows and accumulates in there. It gets embedded everywhere, needing scrubbed out with a wire brush before final sanding prep. I spent the past month doing that for an hour or so almost every day.
The big hole appears to have a really good solid base on it, going on seven years of development. IIRC, it was around 7-8 years ago when it was dug out to the current size and the concrete footer installed. The first few years were just a little 100-gallon starter hole growing from there, probably around 10x that capacity after that last dig..
There were a few small cracks to repair after shutdown last fall, but nothing serious. the 3-gallon epoxy kit will be at least enough for two full coats in there this year. It’s like plastic paint that hardens after 20 minutes, thick and difficult to apply, with mixing and time constraints. It’s also the only thing I’ve found in all these years that actually seems to work well in this application, as advertised.
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