Ok, I performed two patching tests tonight and initial results are in.
Test #1 was using a rounded piece of extra liner and affixing it over the liner with Loctite PL-S30. I cleaned both pieces of liner thoroughly with alcohol, spread a thick layer of caulk on the patch and pressed it into the liner until I achieved squeeze out around the whole patch. Then smoothed the squeeze out around the edge of the patch to protect the edge.
Test #2 was using Gorilla Waterproof Patch and Seal Tape. Clean liner with alcohol. Cut a rounded patch. Place over liner and press in thoroughly with a rubber roller.
I can already tell that the tape is the way to go. It's extremely pliable, incredibly sticky, can be applied underwater if necessary (probably won't do that!), is fully "cured" in 24 hours, and was impossible to remove after just 10 minutes. That means I don't have to worry to much about moving the liner around and unseating a patch as I work on another one.
Downside: They say not to use it on seams, and I have at least one leaking seam that needs a patch.
The liner + PL-30 would probably work fine, and that's what I'd do if I had just one patch to do and already had the materials on hand. But it's a lot more messy and the caulk takes a long time to set up, so I would not be able to work on multiple patches in close proximity without worrying about messing up one behind me.
I will probably still use the PL-S30 on the seam that needs repair as I think it may do the job better in that location.
Honestly, I feel good enough about the tape to just start going for it tomorrow, but I think I've got a bit of pre-work to do to make sure I get all my patches all at once without disturbing the cycling process too much.
Wish me luck, folks.
View attachment 151131View attachment 151132