HH-66 is suppose to be good stuff. I know it works really well on vinyl and PVC. I picked up a can of it recently for adding d-rings.
After a day of curing and deflating and inflating a few times, I'm happy to report that the HH-66 glue has held up well. As it deflates, the sticker stays in place and contours with the boat. There were two corners that I just touched up and two sides but over all its sticking well. It's much better than the adhesive on the back of the sticker.
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Glad it worked out for you. One of these days I'm going to start an adhesive thread. I think if you own an inflatable sooner or later your going to need to do some gluing and what better a place to have some information on it then here.
There are thick plastic bag like things that are inexpensive and they seal to make them waterproof. I use them for my papers then I put that in another bigger waterproof bag that connects to patches I glued to my tubes. I have two of the bags,one on each tube. I keep all the little things in there that need to be out of the way but handy to get at. I got mine from Sea Eagle but I don't think they carry them anymore. You can however go to NRS and get patches with connectors on them that you can glue on a waterproof bag and the tubes of your boat. You can also get the bags at NRS but many places carry them,probably here at iboats too.