Tenacious Tape.

That stuff works. The Kenyon repair tape is good also. I have not tried the Montbell version yet though. Theirs says permanent.

I've used it to patch small tears in a pair of wind pants, a down jacket shell and the bottom panel of a pack. All repairs were done a couple years ago and the tape is still holding up fine through repeated washes/uses.

These are all small repairs, not sure how well it would work on larger repairs or on items with a lot of stress pulling on them (tent panels, etc.).

Thanks guys.

The tent holes are very small…3mm each at most.

Sounds like this will work fine.

Tenacious tape is great. I buy sleeping pads at REI garage sales and repair the leaks with it. Just remember to have all corners rounded, like, make ovals instead of scquare strips so that there is no sharp edge to catch at start peeling. It'll stay on really well.
I also use it to reinforce high wear areas on my rainshell and it has survived several months and repeated washings without peeling, but it will peel off without any residue fairly easily if you actually try to peel it off.

The clear version of the tape is more like a plastic tape, so it will show folds/crease lines, etc. The colored fabric tapes bend and are more pliable. Both are waterproof. You can also run a little seam sealer around the edges of the tape for a more permanent fix.

It's amazing stuff. If you want it to be permanent with just the tape itself, round the corners of the patch so they don't start to peel.

For a 3mm hole, I would just coat with seam grip and call it good.

Is tenacious tape waterproof?

Craig, you'll want to put the tape on the inside (PU coated) of the Shangrila. A dot of silnet on the outside (sil coated) would make sure everything is permanent. The tape won't stick very well to sil.