Any recommendations what to do with my spa?
1) There was a small crack in spa seat wall, which I patched with Rezolin white epoxy putty about 10 years ago and it worked pretty well. Now there is more damage and bigger leak. I wonder what should I do, what to use to patch it? More epoxy putty, Leslie's Patch-it cement, Quickrete Water-stop cement from Home Depot...?
2) Would it be possible and/or make sense to patch the crack (with the stuff you recommend above) and then plaster the whole wall, something like 1 ft from the bottom of the spa, over the Pebbletec? If it was all white / gray it would look acceptable.
3) In addition to the crack, there is this darker spot on the side, as you see in the picture. It has lost most of the surface pebbles, but what else is happening there? Is there water pushing through the wall from outside or why it gets moist/dark after every rain shower?
We are in the DFW area.
Thank you for any advice you can provide.