Hilleberg tent repair
The double-walled Hilleberg Nallo 2 tent is bomber. I've used it in rain, snow and strong winds in the Cascades. Unfortunately, a couple of tiny holes recently appeared in both the inner and outer walls of my Nallo.
I contacted Hilleberg for advice, and they emailed me back a few hours later.
"If they are only a few millimeters, you can almost move the fibers around to make it even smaller and then just add seam sealer over it. For the outer tent you need a SilNet and for the inner tent the SeamGrip. If the holes are larger than just the millimeter size described above you need to sew a patch on them. There really is nothing that glues very well to the fabrics. You would sew a patch and then add the seam sealer to the back of the stitches." – Hilleberg Rep
The solution worked great. I first hand-washed the tent in my bathtub (no soaps), thoroughly dried it, then applied the sealants. A day later, they were ready for my next trip.